What works and what is useless...? My goal is two lowers and three uppers. Plus add what is missing, and replace things that don't work for my application; Like change the FIXED 1 1/4" sling mounting brackets to Quick Release type. I want to improve the color I.D. for having the correct magazines available to the correct cartridge uppers. I now use different color duck tape to I.D. magazines with 6.8 SPC from magazines full of 5.56 NATO. So if you were building a AR-15 what features would it include.
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