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Brownells 75th Anniversary - A Shooting Heritage

Regulate Your AR-15 With an Affordable Gas-Piston System

In comparison to the ubiquitous direct-impingement system seen on most of today's AR-15s, gas-piston systems offer some benefits that make the alternate setup attractive to many AR aficionados. Gas-piston systems introduce less fouling into the gun's receiver, and the setup of the long-stroke piston system found on the Primary Weapons MK-116 Pro Rifle allows users to fine-tune gas flow for specialized uses.

Each MK-116 Pro Rifle is chambered in .223 Wylde, allowing users to run either .223 Rem. and 5.56 NATO with increased accuracy. The long-stroke system on the gun, while remaining affordable compared to other piston-driven guns, also provides three different settings for users. This enables the gun to be tuned for use with suppressors as well as certain ammunition loads, providing enhanced reliability.

  • Barrel length: 16.1 inches
  • Overall length: 32.37-36 inches
  • Ships with one 30-round magazine
  • All-black finish

The PWS MK-116 Pro lineup also includes standalone upper receivers that fit onto any standard AR-15 lower receivers, so shooters can upgrade their guns with the long-stroke system without having to order an entirely new firearm. The guns offered by PWS are outfitted with Radian Raptor charging handles and also feature free-float M-LOK handguards as well as specially designed furniture mounted on the company's Enhanced Buffer Tube.


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