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FREE GUN FRIDAY > Enter to WIN the Ruger PC Charger & PC Carbine, Ammo from Black Hills and the Caldwell Portable Range Kit!

PISTON-DRIVEN ARs

Jay Langston by Jay Langston
January 4, 2015
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PISTON-DRIVEN ARs
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BARRETT REC7. Sean Utley Photo

Over the past five years, the firearms industry has shifted. The number of veterans familiar with the M16 and M4 matured to an age where their discretionary income allowed them to invest in new firearms. At the same time, the presidential election energized firearms enthusiasts to make purchases in anticipation of an anti-gun political leadership. These factors and others created a “perfect storm” of AR-15-style firearms sales and manufacturing. Sales surged and several new manufacturers entered the marketplace. As the number of inventive gun makers increased, the number of stylistic and functional modifications followed. The piston-and-operating-rod system was refined and AR manufacturers began offering this as an option.

sig-516-patrol1
The SIG516 Patrol has brother variants, including the Precision Marksman and the SIG516 SCM (Sport Configuration Model). Look for a future test and evaluation on the Precision Marksman soon! Steve Woods Photo

The U.S. military needed a short-barreled weapon, and the subsequent trials led to the adoption of the first piston-driven 5.56mm, the HK416. The adoption of the HK416 wasn’t without problems, though. Receivers were cracking at approximately 10,000 rounds, which is less than acceptable. The mechanical stresses of the short-throw piston were more than the system could accommodate. Now with a bad taste in their mouths in regards to piston/operating-rod systems, military decision makers cast a wary eye at modifying existing M16s and M4s with piston systems. Other problems cropped up with converted direct gas impingement ARs, such as broken bolt carrier keys and worn recoil tubes caused by tilting bolts. Time passed, and more-reliable AR piston designs were perfected. Today, the Army is preparing a Request for Proposals (RFP) for a carbine upgrade program to piston-driven systems. At the same time, an array of commercial piston-driven systems has hit the market, giving shooters several options.

a3odg
LWRCI M6A3

Several manufacturers offer reliable piston AR rifles and uppers. Some of the companies building piston uppers include LWRCI, which builds the M6A3. Primary Weapons Systems’ DC-16 upper is another, as well as the Addax Tactical gas piston upper and Adams Arms’ retrofit gas piston system. Several firearms manufacturers have added complete piston-driven ARs to their lines as well. Over the past year, I have tested several semi-auto piston-driven ARs from different manufacturers, including Barrett, LMT, LWRCI, Ruger, Sig Sauer, Stag Arms, and Smith & Wesson.

ruger-sr_556_122-steve-woods
RUGER SR-556

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