SIG is historically slow to offer parts or what have you. Advertisement. You have CQB capability with the MCX by using subsonic 300 Blackout ammo, and when you want a longer and more powerful reach, just switch to supersonic. Im curious how a BG full of holes will be able to tell the Po-Po how the gun was held . Product Info for Next Level Armament Barrel Adapter Sig MPX/MCX We created the NLA Sig Barrel Adapter to complement our Sig 9mm Flash Hiders and Comps. Hawaii - no pistol magazines greater than 10 rounds, No pistol magazines greater than 15 rounds, No rifle magazines greater than 10 rounds, Chicago, Highland Park, Cook County, Dolton, Homewood & Oak Park- no magazines greater than 10 rounds, Maryland - no magazines greater than 10 rounds, Massachusetts - no pistol or rifle magazines over 10 rounds and no detachable shotgun magazines over 5 rounds, New Jersey - no magazines greater than 10 rounds, New York - no pistol or rifle magazines over 10 rounds and no detachable shotgun magazines over 5 rounds, Rhode Island - no magazines greater than 10 rounds, Vermont - no pistol magazines over 15 rounds and no rifle or shotgun magazines over 10 rounds, Washington - no magazines greater than 10 rounds, Washington D.C. - no magazines greater than 10 rounds. When I shoit my keltec sub2000 I would have to hold my breath because the gas and dirt were so bad. After Internet research I bought a TNW Asp. Either drop off or send in ONLY your barrel after ordering. I understand that Im probably a minority in this respect, and Sig did take care of me at every turn, so I can respect that. I have two: An M1 Carbine with a Fed Ord underfolder, and an Uzi that I would trade in a heartbeat for something lighter and more modern. This is our review of this interesting firearm. The store will not work correctly in the case when cookies are disabled. All barrels and gas-blocks are proudly made in the USA and engraved ILWT.I do not accept returns on barrels due to liability and cannot sell them as new once they are shipped out and returned. Thanks. There is no additional cost for shipping it is included in the price of all listed parts. Price $279.99. While I love my Sig pistols (which, BTW, were all lost in a boating accident), the price of the MPX takes it off my future buy list. Its just plain old consumer grade crap with a nod to the (weird engineering of the early 20th century). Some states have legal restrictions for the purchase of items so we need to ask for your location. Samedi de 7h30 20h30. 3.5" Threaded Barrel 2-Position Pistol Contour Brace with Integrated Brace Knuckle Polished and Hardened Single Stage Trigger PDW Pistol Grip Firearm Specifications Manufacturer: Sig Sauer Model: MPX Copperhead Caliber: 9mm Luger Barrel Length: 3.5 Inches Overall Length: 14.5 Inches Twist Rate: 1:10 Weight: 4.5 lbs Operating System: Gas Piston Zero didt change either. The ability to swap from one barrel length to another depending on what you want to do is major, and will be even more of a benefit when the .40 S&W and .357 SIG conversion kits come in. At least this review is one of the more thorough ones, if not the most unquestioning. There is no additional cost for shipping it is included in the price of all listed parts. Ooh. Any mention of an M-LOK handguard release? I would like to have the new one ready to install, pin and weld when I remove the old muzzle device. We ONLY offer 1/2-28 thread. JavaScript is not enabled on your browser - our site will not work for you as intended. Disassembly of the gun is easy and painless. Some states have legal restrictions for the purchase of items so we need to ask for your location. ), California - no magazines greater than 10 rounds, Colorado - no magazines greater than 15 rounds, Connecticut - no magazines greater than 10 rounds (larger with a valid permit.). Midwest Gun Works only recognizes City Police Officers, County Sheriff Deputies, and State Police (including Highway Patrol) as L.E.Os. Gun Review: SIG SAUER MPX Pistol - The Truth About Guns It has a durable black oxide finish. We use the tightest of tolerances and highest quality control. Sig Sauer had a winner a year ago. mossberg-930-spx-pistol-grip-for-sale Sig Sauer's MPX-C is going to have a specially designed muzzle brake that is permanently attached to the 6.5-inch barrel, making it a 16-inch-barreled weapon available for civilian purchase. Now the MPX is offered in the PCC competition ready platform that gives you the same reliability with the ultimate in performance. Back to the external controls on the gun, everything is fully ambidextrous. Plan is to direct thread my 13.5x1LH piston with fixed barrel spacer onto the factory 4.5" MPX barrel. Gare. If you are looking for quality and performance, here you go. The grip is also interchangeable with the AR-15, but thats where the similarities stop. The MPX PCC comes with nearly 9.5 inches of rail on top of the receiver and an additional 1.5" rail section at the front of the handguard, perfect for forward sight installation. Are Sig suppressors just as good as the rest? SIG MPX 9mm Submachine Gun Series | SIG SAUER - SIG SAUER | Firearms Youll be glad you did. JavaScript seems to be disabled in your browser. Two is fair, or at least standard. I understand why its more expensive than the Scorpion and the price difference seems justified. (verified owner) August 7, 2020. I think what youre hearing is a loud segment of the market that has been burned by Sig in the past. I may just go with a 1/2x28 muzzle device to attach to it while it isn't suppressed, so it would be ideal to have it as secure as possible. There are no cheap or flimsy parts on the weapon. Im a strong believer that a full-length rifle is pretty much the worst choice for a home defense firearm. SIG Mod X9 Suppressor | Modular Suppressor Technology - SIG Sauer P239 CM, thlacymd I would rather own two Baretta CX4 Storms or three Kel-Tec SUB-2000s for the same price and have magazines which are compatible with my primary handgun (assuming you carry a handgun that matches the magazines). Most of the people I talk to could care less about the ATF opinion letter and those that talk badly about the braces or braced guns generally run out of the store for fear of their own shadowor helos flying overhead. MSRP $849 vs MSRP $1,378 In the end, I opted for a complete refund and left it at that. So you can click on the link below to place your order at firearmsshop.org Thanks Sig Sauer for allow us all to become your beta testers for only $1800 or so ! drugloftpharma.com (verified owner) September 13, 2022. Hence the expensive part. I was so happy with this arrangement that I then purchased the 4 tri-lug with adj gas for my MPX FDE Copperhead. So its heavier than the Scorpion EVO. SIG SAUER SIPMPX3BCHNB MPX COPPERHEAD PIST 9MM 3.5" PMPX-3B-CH-NB | NO BRACE - $1,871.99. If you have an account, sign in with your email address. For an 8 barrel pistol caliber carbine, this is pretty awesome. You posted the exact same thing I did when I went to swap uppers. You could also go the route of purchasing a carbine conversion upper for Glock handguns but that requires the use of a Glock handgun and the total cost doesnt end up being much less expensive. We all voted for it. Otherwise the MPX barrels are 13x1 metric. 9mm M13.5x1 Left Hand barrel Thread protector. Im guessing the latch part is likely a standard AR-15 piece. jmdxrated I was told I would have to buy a complete upper for $600 and put it on the gun. Sig Sauer MPX Parts - MGW This fake suppressor is designed specifically for the tactical Sig MPX Pistol, P226, P229 & P250- 9mm with a threaded barrel M13.5x1 LH. The industry-leading Pistol Caliber Carbine is now competition ready out of the box. tjxtqgcfc http://www.g6r799q2s20nnzuavhuh974405v3r9i0s.org/ Try holding your rifle in one hand aimed at your bedroom door and a cell phone in the other while trying to dial 911 and youll see how difficult that can be. This is significant if you have ever shot a block back rifle and are a lefty. Or put on a new stock? Also that the rifling only goes 8 1/2 inches up and the rest is essentially a tube. Now let us take an educated look at the much derided and misunderstood M13.5-1LH. Lancer Systems as in the best AR-15 magazines on the market and this review from a few days ago: http://www.thetruthaboutguns.com/2015/03/jeremy-s/lancer-systems-l15-lower-receiver/. I bought 3 extra magazines with mine for $130. For the best experience on our site, be sure to turn on Javascript in your browser. While 9mm is a perfectly adequate cartridge, there are still plenty of shooters that prefer a more substantial caliber. The UMP is 5.2lbs, and the Colt SMG is 5.8lbs. Heck, back in the 1980s you couldnt swing a dead cat without running into a movie or TV show where the gun was being used in some manner. The Sig MPX Copperhead is a 9mm Pistol Caliber Carbine made by Sig Sauer. The MPX PCC ships with a 30 round MPX mag and boasts multiple sling attachment points on its quality crafted frame, truly making this firearm a must have for competition shooters. The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 919mm Parabellum.It is a gas-operated firearm featuring a closed, rotating bolt. That just made accuracy issue worst. Manufacturer: Sig Sauer PRODUCT SPECIFICATIONS: Barrel Length: 16" Barrel Thread Pitch: 1/2" x 28 TPI,5/8" x 24 TPI Brand: Sig Sauer Caliber: 5.56x45mm,.300 Blackout Finish / Color: Black Firearm Type: Rifle Material: Steel,Aluminum Models Fit: AR-15,Sig Sauer SIG516,Sig Sauer M400 Popular Brands Their solution: the MPX. The MPX Copperhead comes equipped with the new SIG SAUER Pivoting Contour Brace (PCB) giving pistol users a brace that easily adapts to the movement of the shooter's arm with a patented . SIG SAUER P320/250 Compact 9 mm 4.6 in Threaded 1/2x28 Pistol Barrel (2) $209.99 (Save $10.00) $199.99 2 models SIG SAUER MCX Caliber X-Change Kit (5) $615.99 (Save Up to $6.00) $609.99 SIG SAUER P320 9 mm/ 357Sig 40S&W Subcompact Recoil Spring Assembly (1) $39.99 (Save 10%) $35.99 My current Colt 9mm sports an upper that came from the Dept of Energy. Carrying over a bunch of AR-15 stuff is a great idea, but why keep this aspect that basically nobody likes? SIG MPX - Wikipedia ILWT cannot be responsible for lost or mishandled shipments once they are dropped to USPS. (verified owner) April 16, 2022, I bought the Sig MPX K with the intention of shooting it suppressed. SIG Sauer P365 SAS Ported stripped slide and Ported Barrel OEM Gun Parts. Our site uses JavaScript for a smooth and modern shopping experience; we protect your data and never sell it to 3rd parties. Im a happy customer. It could have been 100% proprietary, but it uses an AR grip, AR safety, AR trigger group, its own stocks or AR stocks, quick swap barrels (no requirement for the expense of a complete upper when the barrel alone can be swapped in a minute or two), quick swap handguards, lots of places to mount accessories, etc etc. gelato-44 The mpx is sweet as honey but the cost of and availability of magazines is a major issue its the primary reason I sent it to another home. I run a good old trigger slappin 9mm Colt so I dont have any preconceived bias towards/against either of them. Enjoy teasing mall ninjas though, Im sure it will be the high point of your range days. This is quality kit here for all the reasons Foghorn states. How easy is it to change the handguards? And now, if youll excuse me for a moment, Im going to go buy one. . MGW carries replacement barrels, stocks, handguards, magazines, triggers, sights, springs, pins and other components for this modular firearm model. Inconsistent accuracy and too much gas in the face. I finally decided to try the 8 inch 3 lug ILWT without the adjustable gas plug. . A lot of people say that you need this "tapered muzzle device adapter", however I spoke with someone that claimed to be an expert who stated it absolutely would NOT be necessary. See pics HERE. Not only is the AR-based training compatible with the MPX, but some of the parts are as well. Hammond, Louisiana. This MPX rifle from Sig Sauer is chambered in 9mm and boasts a full 16" carbon steel barrel with M13.5 x 1 threading and ships with a 3 chamber compensator for reducing muzzle jump / recoil. where-to-buy-guns Though being blowback, it does kick a bit more than the MPX would. Note: This item will only ship to a Federal Firearms License Dealer (FFL). The aftermarket has saved us from expensive OEM magazines many times in the past with perfectly functional, less expensive alternatives. (verified owner) May 31, 2022. Tapered Muzzle Device Adapter for MPX - In Lead We Trust Adding a suppressor the accuracy remained the same but I would get weird POI shifts, probably barrel harmonics but it was different every time. 4-aco-dmt So people need to stop comparing it to an MP5. It is! Along the top of the rifle is a full-length Picatinny rail, which is great for mounting optics and other accessories. I have a couple of Geiselle SSAs sitting in my parts bin and I am not sure that a change would even be an improvement. If I didnt have a 9mm AR, I would look hard at this. It was a Cadillac ride when I got my turn before lunch but it didnt even make it to the end of the day before being pulled off the line. The newest entry into the market is the new CZ Scorpion. Aw, come on Nick, changing uppers, changes the barrel. Voila, .223/5.56mm to .300AAC in under 10 seconds. MPX PCC is built to perform at the highest level with zero modifications and give you the reliability you have grown to expect from the MPX. B. Minimum shipping rates are as follows: * Any additional shipping charges not shown during online check-out will be presented to the customer for approval prior to processing the order. Even though that extra 600$ cost is for functionality that is quite literally not available to us anywhere else. Brian Malek My MPX is terrible here are the issues explained: http://youtu.be/1LITUe8J5ps. Great job. Stripped lower receivers will NOT be shipped to the following states: Complete AR and AK receivers will NOT be shipped to the following states: Midwest Gun Works DOES NOT ship high-capacity magazines (those greater than 10 rounds) with firearms to the states listed below. This MPX rifle from Sig Sauer is chambered in 9mm and boasts a full 16" carbon steel barrel with M13.5 x 1 threading and ships with a 3 chamber compensator for reducing muzzle jump / recoil. Browse by individual sku to find the right product for you. The MPX is a pistol. Restricted in some areas . I already own a Beretta CX4 in 9mm, and I love it. This is the barrel that Sig should be putting on this gun! Tried with Sig SRD9, Octane 9, and Omega 36M but nothing was satisfactory. Please check your State, County, and City laws for restrictions before ordering. Even with that trigger, though, accuracy is pretty nice. Joseph Bender This combo produced a best group of 1.12 inches with the 125-grain SIG Sauer ammunition and 1.15 inches with SIG Sauer 220-grain subsonic ammo. More accurate than the CZ Scorpion Evo 3 S1 pistol to be sure. I did some research and found the inleadwetrust barrel. Thumb Safety Thats what Im doing While SIG and CZ seem to have TEC-9 that doesnt suck figured out, I still want my own. Cool stuff. I would go with the 8 forend and pick up the 4.5 barrel when available. These design features, rare in submachine guns, were chosen to enhance the safety of the user and to have a more reliable firearm. The R&D guys say that Aguila ammunition wont run in the gun, but we fed it a steady diet of nothing but Aguila for a little bit and the gun didnt even hiccup. Ten mm is still not available everywhere but I can get .40 cal easily, so im rarely without ammo. If you are looking for cheap, look elsewhere. I am also a left handed shooter and this was the only option that will eject to the left. Service your Sig MPX with quality OEM and aftermarket parts/components to ensure a solid performance from each and every shot. Sig MPX PCC with Thordsen Picatinny Buffer Tube Adapter, Buffer Tube, Castle . Sig Sauer MCX Upper 16" Barrel AR Conversion Kit, Tapered Lug, MLOK - MGW Action: Semi-auto Anybody looking for a low round (about 100 total) Vector Uzi carbine complete with scope mount and multiple mags? Ready to serve Every aspect of the SIG MPX firing system has been rigorously designed and tested. It wasnt selected by TTAG, it was selected by the folks who read TTAG and chose to vote. Specs Caliber: 9MM Weight: 4.5 lb Barrel Length: 3.5 in Operating System: Gas Piston Pros Small and Compact Concealable Cost Effective Ammo Cons Price Loud I am thinking it had less than 4,000rds through it? Yes, the Rattler can shoot. (verified owner) December 8, 2020. . I'm going to remove the bird cage flash hinder and build/install a muzzle device out of Ti and need to know what thread size to cut. Firearmsshop.org is one of the best psychedelics company that ship to all states within 24 hours an also ships 3-6 days internationally. mdma-pills 9mm barrels have a double standard, I'll grant you that, but it's usually 1/2x28 or 1/2x36. I dont think I know this saying (swinging around red meat). The CZ looks like shit compared to this btw. Honestly, you shouldnt expect any rifle/carbine shooting 9mm with a price point over a grand to sell well. The store will not work correctly in the case when cookies are disabled. The biggest question people are going to ask is what good a pistol caliber carbine really is. Sight unseen in the civilian market, they awarded it the highest honor last year naming it 2014s Best New Rifle, and now after months of delays the first guns are assembled, boxed, and shipping out. If youre on the fence trying to decide, dont waityou need this! firearmsshop produces the most quality armor products such as AK-47 AK-74,So you can click on the link below to place your order. Just about every law enforcement or military organizationin the modern world uses some derivative of the AR-15 / M-16 design, and even if the design is different, the manual of arms is mostly the same. If there is a function issue obviously I will make that right if it is due to my product. SIG MPX COPPERHEAD - GEN II - Capitol Armory (12) 12 product ratings - Sig Sauer Factory Replacement 3.9" Barrel Sig Sauer P229-1 E2 9mm - BBL-229-1-9. - 62mm is the stock extension length for Sig Sauer . . buy-ak47 I looked like a total dumbass to my forum pals and IRL shooting buddies who ended up with SIG boat anchors at my recommendation and I still havent lived it down. Since the majority of the variability is in the vertical component rather than the horizontal, I get the feeling that the ammunition (Federal 115 grain standard ammo) is to blame, and the gun is capable of much better accuracy with better ammo. Barrel Thread Protector. Price is not a factor in whether one thing is better than another. That is a great point. The MPX is very accurate and very controllable. Bottom line great product and great service! I didt shoot it unsuppressed but other hosts shot well with the same can and suppressor alignment with adaptor was good. This firearm is restricted in some areas and may require a verified account or qualified credentials to ship. mushrooms-capsules Why not? Every aspect of the SIG MPX firing system has been rigorously designed and tested. When you turn a firearm into an SBR, you become the legal manufacturer of the SBR. My personal preference would be the shortest (~4) barrel and longest (~10) handguard. My 9-10 inch groups shrunk down to 1.5-2 inch groups at 25 yard. The Sig Copperhead black keeps the same features as the FDE with the addition of a threaded barrel and black finish. The PCC boasts QD sling points; on both the right and left portions of the stock as well as the 6 o'clock position at the back of the receiver. Not many replacement parts options, either. Midwest Gun Works sells firearms only in accordance with all Federal, State & Local firearms regulations. For the best experience on our site, be sure to turn on Javascript in your browser. You announced this damn thing before then Evo hit the market. Due to my absolute obsession with my MCX I took a risk and got a decent deal on a 2nd gen MPX recently. Im not sold on this at all. Everything about this gun feels perfect in your hands. chuckcarternc US Machinegun: SIG SAUER MAGAZINES & PARTS I went from thinking about selling my mpx k to now enjoying it and not wanting to sell it. . Inviting a confrontation like a red cape attracts a bull. If your going suppressor then nick is correct mpx is for you if not the cz is the better cheaper option. This is with a cheap red dot and minimal load testing. Fits Sig Sauer MPX, most Sig pistols and other 9mm pistols with 13.5 x 1LH threads. 7-hydroxymitragynine Dont recall CZ saying they had any known ammo incompatibilities right out of the chute. Both a SIG Sauer MPX-K SMG and an FDE P226 MK25-D-RX with a threaded barrel were used to test drive the SRD9. Some products have purchase restrictions for those under the age of 21, please verify your age. You will need to chase the thread after removing the muzzle device as some of the threads have melted due to the welding. Before this product is shipped your FFL Dealer must email or fax a valid FFL to Midwest Gun Works. mandalorian-armor-for-sale Posted: 6/28/2020 7:07:13 PM EST [#5 . Length is .525" Outside diameter is .640 With a clean crisp knurl. Griffin Armament Unveils Bushwhacker 46 Universal . Theyre on Gunbroker in ones and twos, for around 2k new or 1k used. The new MPX K updates include a flat blade Timney trigger, threaded barrel, new folding brace, and M-Lok handguard. The MPX is a brand new design, and in 2015 I think everyone wants non-reciprocating, forward charging of some sort. Why bother with a more complex piston operating system if youre not saving weight by cutting the BCG mass? Its nothing like the MP5. Its cute watching a fanboy meet his biggest crush! SIG is supposed to make a conversion kit for current owners of the 9mm MPX to be able to convert to another caliber when it becomes available. Everyone and their brother own an AR-15 these days, and while having the coolest AR-15 on the range is nice, whats even cooler is to have something legitimately different. The side-mounted bolt catch, AR style safety, and push-button magazine release are staples of every modern infantry weapon design, and in an effort to keep the training as simple as possible they incorporated these same controls into the MPX. Sig MPX PCC Review - Guns and Home Defense You took it a bridge too far when you said its better in every way. Specifications: SIG Sauer MCX Rifle Platform OPERATING SYSTEM: Short Stroke Gas Piston CALIBER: 5.56 NATO 300 Blk 7.6239 (not yet available as of 12/2019) OVERALL LENGTH (IN): 25 in (635 mm) - 35.5 in (905 mm) OVERALL WIDTH: 2.8 in (71 mm) HEIGHT: 8 in (203 mm) BARREL LENGTH: 5.5 in (140 mm) - MCX Rattler 6.75 in (171 mm) - MCX Virtus PDW Remove the handguard (take out the front takedown pin and they pull straight off) and then un-screw two small screws and the barrel comes straight out. MPX Barrel/Handguard Service. Dude what on earth is it with the rifle of the year thing that bothers people? I paid $400 for my Sub2K $650 for my CX4 and $960 for my FN PS90. The thing is, I dont see how much of a market there can be for this, when for between $500-$700 you can build a 9mm AR, with all the modularity that entails. If unsure please contact me first and I can possibly help with identification and input. It is the responsibility of the purchaser, to check your local laws before ordering products from Midwestgunworks.com. The Gen 1s had a bit more blow back when using certain suppressors. , Ill buy one of course but I may wait until the cool factor is gone a little because you know the problem is going to be hyper high prices because so many people want it. Free shipping. Id really only go the Form 1 route instead of buying the factory SBR to save time use the gun in the meantime, get the stamp back in like 50 days, rather than waiting for transfer from Sig to dealer, then 90+ days for Form 4 from dealer to me, and not being able to play with the gun that whole time . Although I own a Ford Focus. Beretta always does it better and sexier. The Fora platform includes forum software by XenForo. SIG MPX ZR Tactical Solutions The use of MPX on this page is merely to advertise the sale of MPX type barrels, parts, or components. What a deal. Our Sponsors. The Scorpion ships with a bore snake because thats really the only way to get to it. Hopefully. My MPX-K has a tapered barrel. What is a Threaded Barrel? - Silencer Shop Why cant manufacturers get the trigger and the magazines right on the OEM models? You have entered an incorrect email address! Im just guessing, as Ive never had mine fail on me. 2011BLDR. Compared to the MP5 and CZ Scorpion Evo, and most rifles and pistols on the market, this thing allows you a ridiculous amount of options for customizing just about every part on the gun. Are they going to offer a true 16 carbine version of this or what? The magazines have been custom designed by Lancer to actually work. Big problem with using DT suppressor adapters on MPX is the damn LH threading. exemptions. Or, heck, get a 4 barrel and a 10 handguard for maximum rail space and minimum overall length. Such a fun gun!!!! MPX Barrel Cut and Thread ZR Tactical Solutions 4) So you can slap home the charging handle on the CZ, whereas on the MPX.uhh cant do that. Pistons are only required for barrels that move, such as on pistols with Browning-style recoil actions. So yea, the interchangeable parts like barrel swaps are great. The overall appearance of the MPX might seem familiar. If so could you post them? It is the responsibility of the purchaser to make sure that they comply with all federal, state and local laws. There isnt a straight shot into the chamber. M4-Like Handguard For a better experience, please enable JavaScript in your browser before proceeding. . You wanted Ambi controls cheap magazines, a rail system, easy takedown and mags that work in your pistol? Youre not 15 anymore and Jeff Spicolis moment was 33 years ago. acacia-confusa-root-bark The gun looks awesome, has some killer features, and seems to be well built, but the real test is whether the gun runs out in the real world. buy-dmt-online Its a fairly expensive, high-end gun and it deserves a high-end magazine that functions flawlessly and holds up, both of which these should do. . Sig MPX gas port - Brian Enos's Forums Maku mozo! Never mind. If there is a function issue obviously I will make that right if it is due to my product. Oh wow. Pull a few pins and the whole thing comes apart, even the handguards. Bolt wipes clean easily too. Rail Systems -.438 Threaded muzzle on both tpi only and tri lug with tpi New trigger? And yes, Im posting this just to poke fun at his marksmanship and for no other purpose. I wonder about the problem, and how solved it is for 9mm. buy-flakka Delaware - no magazines greater than 17 rounds. For more information visit SIGSauer.com . I was gonna say they started shipping from Sig to wholesalers on Monday. THIS is where the Sig shines. I may eventually get an MPX (as I said, I am a big Sig fan), but I think Ill wait until the crazy price feeding frenzy settles out. The rear of the MPX has a Picatinny rail cut into it, allowing you to mount basically whatever you want. Customization: * * * * * US Machinegun: *Sig Sauer MPX & PISTOLS 13.5x1 LH to 1/2x28 RH Thread And 9mm is cheaper than 5.56 or .300.