The only LPK that I've heard bashed online is DPMS and even then, it was a one-time thing.
I just installed four Stag/CMT lower parts kits into Tactical Innovations lowers over the weekend. Both the parts kits and the lowers appear to be top-quality.
Colt and LMT are the two best I have seen. The problem is that both are rare and hard to find.
C4
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