Re: AR15 and Suppressors
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Griffin Armament</div><div class="ubbcode-body">The piston guns drag the bolt across the barrel extension lugs.</div></div>
I used to think this was the Achilles heel of the aftermarket piston conversions, based on an interview with Reed Knight that I read a few years ago. Remember, he had Stoner working for him until Stoner's death. In the DI design, when the expansion chamber inside the bolt carrier is at pressure, the bolt is pushed forward as the carrier moves to the rear. Many piston conversions overlook this part of Stoner's design. The Adams Arms system has a spring loaded bolt head, as does the HK system, that attempt to address the issue of shear force on the bolt lugs.
However, after speaking with some armorers at 5th group, they say that sheared bolt lugs are one of the main component failures they see on the M4 carbines. And all of these guns are DI - not piston. But remember that anything other than 20" barrels with rifle buffers must be considered suspect.