Sig Sauer MPX 9mm 8in Threaded Barrel - Off Duty

Sig Sauer MPX 9mm 8in Threaded Barrel - Off Duty

Run the SIG Sauer MPX in a compact 9mm pistol with an 8-inch barrel. This Off-Duty Program model is sold only to qualified purchasers. It has the MPX's short-stroke gas piston and closed rotating bolt in a 9mm pistol with an M-LOK handguard, a full-length Picatinny top rail, and a 35-round magazine.

The MPX does not use a straight blowback action like most 9mm platforms. A short-stroke gas piston and a fully closed, locked rotating bolt keep the action smooth, cut felt recoil, and keep the internals cleaner. SIG built it to run all weights and brands of 9mm ammunition with no gas valve adjustment, so range loads and defensive loads cycle the same way. Its AR-style layout, with ambidextrous controls, helps shooters who already know the AR manual of arms.

The 8-inch barrel is long enough for good velocity and a compact 9mm package. The slim M-LOK handguard gives you attachment points for a light, laser, or grip, and the full-length Picatinny rail carries an optic with room to spare. Flip-up iron sights are listed with this model, and a black polymer pistol grip and a black finish round it out.

This pistol comes with one 35-round polymer magazine, and it is a good fit for home-defense, training, and range use. Explore our full lineup of NFA items and suppressors at https://www.nativeoutdoors.com/suppressors, or stop by the store — our staff can walk you through whichever purchase and transfer process applies to your situation.

Frequently Asked Questions

Q: What caliber and capacity is it?
A: It is chambered in 9mm Luger and ships with one 35-round polymer magazine.

Q: Does the MPX need gas adjustments for different ammo?
A: No. SIG designed the short-stroke gas piston to run all weights and brands of 9mm ammunition without adjusting the gas valve.

Q: Is this a pistol or a short-barreled rifle?
A: It is a pistol. Adding a shoulder stock would make it a short-barreled rifle, which requires an approved ATF Form 4 first. Our NFA lineup and staff can walk you through that process.

Q: Can I mount an optic?
A: Yes. The full-length Picatinny top rail takes an optic, and the M-LOK handguard takes lights, lasers, and grips. Flip-up iron sights are listed with this model.

Q: What is the barrel length?
A: The barrel is 8 inches.