Here are some of my “builds”. I typically put my lowers together and buy my uppers.

Top one is a BCM 14.5 inch mid-length upper ($805 with BCM bolt carriers) and an Aero lower ($124 including the guts)
Bottom is an Aero lower ($160 with A2 stock) and PSA 18 inch “Cold Hammer Forged” upper (FN barrel) with rifle-length gas system and Geissele handguard ($599 with PSA bolt carrier)

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Here is a 14.5 mid-length and 11.5 carbine BCM uppers ($805 a piece including bolt carriers) and Aero lowers ($124 a piece)

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Here is my KISS “pistol”. PSA 10.5 upper with carbine gas system ($279), Aero bolt Carrier ($80) and Aero lower ($124). This gun runs as well as my BCM “pistol” at ranges from 0-100. So if all you need is that, not much use for premium barrel and all that crap.

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Biggest thing I can say about my builds, is I knew how heavy I wanted them to be and what handguards, etc. It was easier just to buy already made uppers with the components I wanted vs building because they were available.

Last edited by Gooch_McGrundle; 01/10/22.