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What is good overkill and what is stupid overkill? Thoughts?
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It's your money, do what YOU want to do with it.
I have replaced the non mil-spec bolt and RE in my old M4gery Bushmaster with mil-spec parts. I use mil-spec for all builds 95% of the time. I know guys with non mil-spec AR's that run great and are high round count guns. In excess of 10K rounds. You can't say that a commercial quality AR well fail at X amount of rounds, it may run as long as a mil-spec counterpart. The ODDS are a mil-spec well be more reliable.
I've seen Colt BCG's and bolts fail at a low round count and DPMS/Bushmaster run over 10K rounds. It's difficult to find a poorly made commercial AR anymore.