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SHOT Show 2013: SIG Sauer's MPX Subgun

January 17, 2013  | 

Photo courtesy of SIG Sauer.
Photo courtesy of SIG Sauer.

SIG Sauer will produce a piston-driven select-fire subgun that runs three pistol calibers in an attempt to revive a stagnant firearm category, the company announced at SHOT Show.

Using a short-stroke gas piston system, the SIG MPX can accept 9mm, .40 S&W, and .357 SIG rounds via proprietary 10-, 20-, or 30-round magazines. In fully auto mode, the MPX can cycle 850 rounds per minute.

In look and feel, the MPX more resembles an AR-type rifle rather than the Heckler & Koch MP5 subgun. This design choice was deliberate to ease training for officers trained on an AR rifle, according to SIG.

SIG will produce four law enforcement only versions of the MPX. The standard SIG MPX is a 6.5-inch-barreled subgun. The SIG MPX-SD arrived with an integral supressor. The SIG MPX-K is a compact variant with a 4.5-inch barrel. A select-fire pistol version with a 6.5-inch barrel rounds out the models.

SIG will also produce the SIG MPX-C, a semi-auto varient with a 16-inch barrel, and the SIG MPX-SBR, a 6.5-inch short-barreled rifle. Buyers would be required to obtain an NFA tax stamp for $200.

The MPX includes a collapsing buttstock. A folding stock will be available as an option. The self-regulating gas system enables the feeding of a variety of ammunition, such as frangible, subsonic, or high-velocity.

The civilian versions (SBR, pistol, or 16-inch carbine) will retail for between $1,800 and $2,100.


Select Fire Carbines vs. Submachine Guns

The Role of Subguns In LE

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Comments (7)

Displaying 1 - 7 of 7

DriverX @ 1/18/2013 2:35 AM

Why is Sig so afraid of two cartridges? Why not .45 ACP and 10mm-Auto??? no gutz no glory! That explains why glock has a larger market share! Sig, you also need better artistic designers, this subgun looks bulky and clunky especially around the stock area. Come on Sig we have hopes for you yet!

Rusty Shackleford @ 1/20/2013 8:07 AM

Probably because they realize that rolling it out in the two most common calibers among civilians and law enforcement makes a lot more sense that 10mm and. 45.

Job @ 1/21/2013 9:01 PM

I agree at least a 10mm option, I love the mp-10, two shot burst, great entry gun.

guncrazy @ 3/13/2013 5:56 PM


Stan @ 3/27/2013 11:05 PM

I was doing some research on this firearm. The carbine (civilian) version is a 6.5 inch barrel with a 9.5 inch muzzle brake permanently attached. You still have to get NFA tax stamp to buy because it's not a true 16 inch berrel. Seems like Sig lost a chunk of the market with that move. If I have to pay for the stamp, I might as well get the SRB. I can get that in 9mm, 40, or 45 for the M4 for a quarter of the price. I had high hopes as a substitute for the open bolt MP5.

Stan @ 3/27/2013 11:13 PM

Sorry, MP5 fires closed bolt. I meant to say sub for the blow-back op MP5.

Cymond @ 5/16/2013 8:21 PM

"You still have to get NFA tax stamp to buy because it's not a true 16 inch berrel."
No, you don't. Why do people believe that? The barrel length measurement system *includes* permanently attached muzzle devices like comps, brakes, & flash hiders. Otherwise, every Vang Comp modified shotgun would need a tax stamp. There are plenty of companies that offer AR-15s with 14.5" barrels and perm-welded flash hiders.

Why not 45 & 10mm? Because those won't fit in an action designed for 9mm/40S&W/357Sig. Of course, they could make a larger gun but that would hurt reliability with the shorter 9/40/357. Very few military or police units use 45, especially outside of the US. Sig is just marketing to the majority of their customers.

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