While at work perusing through this site and others that prefer higher grade gear, I was thinking to myself how much fantastic information we now have at our fingertips that can explain why certain processes and materials are better than others in creating parts for a reliable, hard-use defensive carbine (Needed to make this distinction, as I'm not talking about plinkers, match rifles, varmint rigs, etc). For example, we know that we should be looking for Mil-Spec 11595E - 4150 Grade Barrel Steel (CMV) and for HPT/MPI when looking at barrel specs and that we should be checking the BCG for specs that mimic BCM BCG specs. I know there's tons more I can add, but you get the point.
For the major components of the AR it seems that one can easily look up why certain parts from certain companies are considered superior to 'run of the mill' parts from lesser companies. However, I don't think I've ever seen specific information regarding what makes one LPK better than another. What are the specs for these parts?
I apologize if this has been covered before, but the LPK, at least to me, is the most enigmatic piece of the AR puzzle, as I've never seen specific information as to what the golden standard is. Plus, people are very secretive as to who makes the parts that are considered good. Yes, I know COLT AND LMT are two, but it seems that there are other manufacturers that also make good parts, but it's not kosher to disclose who.
ETA: I wanted to add that I have the most experience with CMT/STAG LPKs, which, by most accounts, appear to be, I guess, 'decent' quality. However, when I received my LPK from GRANT the parts appeared to look better.


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