Letter From Mike Williamson Re: No-Name AR-15s
Dear Jim, To add to Pat Cascio’s comments on AR rifle construction, I thought I’d share the following: This document explains the criteria. This chart puts them all together One of the very critical components is the buffer tube on carbines. The aftermarket tubes are of 6061 aluminum, versus 7075, and are milled, rather than being hammer-extruded. They are about half as strong as mil-spec, and have less gripping surface on the threads. This is probably one of the most critical areas of failure on the rifle. Please note that Knight’s Armament is not mentioned on this chart, but they …