The MPX-C’s stock rails slide forward to nest in grooves built into the upper receiver, and the buttplate rests solidly against the back of the receiver when collapsed fully this makes for a very short resulting 28.5 inch overall length on a full 16-inch-barrelled rifle. However, one quickly notes that this is not a collapsible in the fashion of an AR-15, where the length of the buffer tube dictates overall shortest length. The stock was a metal-framed collapsible unit that retracted fully to the back of the receiver, as well as having an intermediate length and a fully-extended length, for a total of three positions. The Sig Sauer MPX-C model I was able to test had a 16-inch overall barrel length, the last 2 inches or so of which was a three-pronged flash hider. Luckily, if you can find them on the open market, they usually bring between $1,600-$1,800. It ought to the MSRP of this little beast is just a bit over $2,000. Overall, the Sig Sauer MPX-C that I tried did not leave the user wanting or needing to modify the gun with aftermarket go-fast gadgets the gun already comes ready to rumble once you add your accessories. Speaking of the sights, The Sig Sauer MPX comes standard with Sig Sauer’s line of folding iron sights, but the full-length picatinny rail in the top of the rifle, combined with the keymod accessory mounting points, allow you to mount your choice of optics, red dots, lasers, flashlights…you know the drill. Rest assured that it is solid enough for a sighting system to be mounted at the range I pulled the rail off the gun and reinstalled several times between magazines, and the sights’ point of impact remained unaffected. ost AR type handguard rails are clamped on the barrel nut with set screws in some fashion or another the MPX’s system is slick and clean with no extra hardware needed. Once one pushes out the forward takedown pin, the rail is unlocked and is free to slide forward and off the gun. The Sig Sauer MPX platform sports an innovative free-floating rail with keymod attachment points, that interfaces into the upper receiver with a slick groove setup – and it is completely removable with no tools required. A nice design feature – especially since many of those who purchase 9mm carbines will do so to run them with a suppressor. It’s a short-stroke gas piston system that sports an auto-regulating gas valve that allows the MPX to theoretically run all weights of projectiles, from target subsonic ammo to full-tilt +P loads without a hitch…and should also allow the use of a suppressor with minimal hassle. The operating system is still gas-operated, even with the comparatively low-intensity 9mm round. Read More: AR-15 Magazine Management Strategies All of the MPX’s controls are fully ambidextrous – including the magazine release, charging handle, and bolt stop – usually rarities from the factory on an AR platform. Take the upper/lower receiver design of an AR, along with the AR’s charging handle, control placement, and general order of operations, then combine with a short magazine well and collapsible stock from an MP5, and you’ll have a pretty good idea of what an MPX looks and feels like. The Sig Sauer MPX, on first glance, appears to be a conglomeration of an AR-15 and an MP5. These pistol-caliber carbines are defined by smaller frames than their rifle-caliber counterparts, light, quick-handling characteristics, fast rates of fire in full-auto versions, and mild, controllable recoil. The Sig Sauer MPX family of guns is a modern take on the submachine gun class of firearms that started with the Thompson “Tommy” gun, and has since evolved into well-known guns such as the German WW2 issue MP40, the Israeli Uzi, and the ubiquitous Heckler & Koch MP5.
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