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Parts
LR-308 uppers are not as simple as AR-15 uppers. There are a number of standards. My LR-308 Super Lowers are designed to use the LR-308 / DPMS standard. Unfortunately, not all companies properly name their uppers, so care is needed. Bear Creek Arsenal, Aero Precising, and KAK all make LR-308 uppers that will work with my lowers. Bear Creek incorrectly calls them AR-10, and Aero calls theirs M5. True AR-10 uppers will not work. Below is a more in depth video.
Hey do bear creek arsenal uppers still work? I saw a comment you made mentioning only kak and aero would work on your forum. Are those the only 3 that will work? I was hoping to use a psa upper if possible.
PSA has made some changes to the lugs that can cause issues. BCA should still fit.