Letter Re: HK 416 Gas Piston M16/AR-15 Rifles and Upper Receiver Assemblies
James: Regarding the HK “416” [gas piston operated M16]s. I found a video about them. Do you think that [semi-auto only variants of] these rifles–or at least upper receivers–will be available to civilians any time soon? Also, do you know if they make a .308 [AR-10] version of the gas [piston] operated .223 you linked to? Thanks, – S.F. JWR Replies: As background, I should first explain that standard AR-15s, M16s, M4s and AR-10s use gas tube impingement rather than a gas piston to operate their actions. This blows powder fouling back into the action. Heckler und Koch of Germany …