Originally Posted by
markm
Most of the critical components would be in the Geissele trigger. You can skimp a little on the rest. Not sure what available kits are out there less the trigger group. G&R has the Colts, but that's over $60. I think Bravocompanyusa had complete DPMS in the $40s range. You probably don't want their barrels or Bolt groups, but for the small parts of an LPK, you're probably ok.
I've had some DPMS sourced LPK's develop stupid tricks with the selectors and in-spec 2-stage triggers, it does work but it's not confidence inspiring to have ran across those problems. You can still do better for a touch more money and mostly patience.
The RRA NM (2-Stage) is bad. Seriously, for that money get anything else, there are threads here on why - I didn't think I'd have issues with the really low round count on mine, but it still is basically a garbage single stage already... TU in under 600rds had me wanting to break out the early 90's EDM in our shop and see how much better I could do with no prints or idea what I'm doing, they're that bad.
The DD LPK's are trickier to find, but those are a solid value; when Grant is able to source enough LMT and other parts to make the G&R LPK's happen those were absolutely unbeatable (especially with the G2S trigger option - I mean this was THE answer, I'm still grumpy I only have 4 G&R LPK's and as many SSAs in those lowers). Even though the Colt is pricy, it's excellent. I'd take the CMT (Stag) LPK over any of the other cheap answers (DPMS,CMMG,Spike's,PSA) because they're at least decent. I haven't ran enough rounds through my Armalite LPK Lower to have a really useful opinion, but I only have it because of the deal I got on the thing - where I can find them now it's still cheaper to go Colt/DD LPK and G2S so no reason not to do the latter.
LPK's aren't high stress items, but when they're out of spec it's a pain in the arse to sort out - especially for somebody new to the platform - so just spend an extra $10 on something that is a known quality setup and work from there, since it can cost that much in ammunition just to figure out why some small thing is going wrong. The trigger is the important part, but the G2S is every bit as good as the SSA in my sample size (one G2S, 5 SSA's) so that's an excellent candidate to keep the setup in budget.
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