Re: how to tell if receiver was trued?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DebosDave</div><div class="ubbcode-body">JJ, I can see that, but you are talking a total truing job. When the threads aren't re-cut, then what would be the point of facing the action on this? The only thing that seats on the face is the barrel nut, which pulls the barrel tight to the threads, it will do the same job on an un-trued face. And lapping the lugs, that only ensures you are getting full contact, so not sure what the point of that would be on a floating bolt head.
Doesn't make sense to me in this situation...
DD </div></div>
If the barrel nut face and the receiver face are not true to each other you will get contact at one point before the rest, then under torque it will straighten things out. This "straightening" will cause undue stresses in the tenon ring that don't need to be there if things are true. That would be my reason for cutting the receiver face AND the barrel nut true to wherever the factory threads are.
If you're going to go through all that work to get it setup for this though, why not just do the whole thing right? It doesn't take very long to recut the threads, lug abutments and receiver face and do the job right.