In this review, we take a look at a pistol version of the Primary Weapon Systems MK109 long-stroke piston-operated AR-15 chambered in .300 Blackout.

Fans of piston-driven ARs now have a new option in the BRN-180 system, a modernized recreation of the unique AR-180 as developed by Eugene Stoner.

A short-stroke gas piston system allows the SIG MPX to run reliably across 9mm NATO and .40 S&W calibers, and the higher velocity .357SIG cartridge - without adjustments.

Stag Arms's Model 8 and Model 8L (shown) next generation gas piston rifles has been built from the ground up incorporating features that makes it run better, cooler, and cleaner than similar rifles.

The primary difference between the T65 and the M16 is the incorporation of a short-stroke external piston gas system instead of the internal piston gas system used in the M16.

Designed in 1977 and introduced the following year, the legendary short-stroke, gas-piston-operated Steyr AUG was immediately adopted as the standard battle rifle of the Austrian Army as the StG ...

His submission in the AS-10 (X)-11-56 designs were an adaptation of his short-stroke gas piston driven tilting bolt design.

Because a piston with a short stroke doesn't have to travel as far each cycle, it can cover a greater distance in the same amount of time versus an engine with a longer stroke and smaller bore.

The standard CSA45 carbine features a short-stroke gas piston operation with rotating, locking bolt.