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New PSA 16"upper and bolt carrier group,Black Creek Precision lower and PSA /magpul lower parts kit.PSA 32 round Colt pattern magazines.I have loaded 124 grain ball bullets over 4 grains of unique,1.1 "oal to start and am having very mixed results.Case extraction is 100% but I get intermittent double feeding where I'll get one mag that will shoot all 32 rounds and next magazine will give me 2 double feeds in 4 rounds (loaded in same mag).I have tried heavy buffer and standard buffer without difference.I put in material in tube to limit bolt over travel so that bolt locks back just behind bolt stop as suggested by others.I have 10 magazines and have not shot enough to see much difference between them ,all numbered of course.I am going to try some of the other powders that I have on hand (titegroup,bullseye and 231) to see if that will help.I ordered some 115 grain ball bullets to try.The pressure on the primers with the unique load is fine but I really hope that you experienced guys will offer suggestions so that I can have a gun that runs!!!!