How so? I'm not exactly sure what you're saying here, so this is a slightly tedious reply.AR design is headspaced on the receiver extension. Nothing to do with upper receiver. Bolt and barrel assy.
You actually headspaced your 300 blk or did you check it?To the OP, @fzd ,
I did headspace my 300 BO build, and probably will continue to headspace just as a precaution. But many people have succeeded with the "it probably won't blow up" approach. Not my style.
Fair question. I checked the headspace of it using Go/No-Go gauges. I don't have equipment or expertise to adjust the headspace at home.You actually headspaced your 300 blk or did you check it?
I’ve never received anything out of spec but have read reviews from people claiming they did. Pretty sure I’ve seen a couple YouTube videos about it as well.straight question: do we really need to check headspace if the upper receiver, barrel and bcg are the same brand? I recently built two ar15s, all using Aero Precision parts. It has good reputation but just wondering if any one experience out of specs parts?
Thank you.