KAC / LMT are the same lower forgings. The Larue is billet, and might have a bit tighter tolerance , you would need to file down the upper in the rear and the pin size might also be different.
Originally Posted by tom12.7
I've tried swapping uppers and lowers on a few. The KAC and LMT swaps went well. Either with Larue looked real close, but it would've taken more force to put together than what I was comfortable with.
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