Re: New stripped lower question
Absolutely nothing wrong with a DPMS LPK in my experience. I've used them in at least 4 builds and consider them a preferred source for a basic LPK. I've also used Stag, Daniel Defense and Palmetto. The only one to avoid is the Palmetto, again in my experience. You'll hear from others that swear by their kits, and the price is right, but the quality can be hit-or-miss and I definitely got a miss. As for having to "beat" the DPMS pins into the lower, I've never experienced anything like that. I'd really question whether the lower was in spec.
BTW: DPMS and Bushy are both owned by Cerberus (along with Remington, etc.) I'm guessing that the parts are sourced from the same vendor(s). FWIW I'd never buy a complete rifle from DPMS but the parts kits, and their lower receivers for that matter, are GTG.