Big bore side charging upper Handguard Side-Charge: My understanding is you need a complete upper designed to support this. Does anyone here have any experience with a "side charging " upper in the AR class of rifles . Got this while back and it's just been collecting dust. logo. Moriarti Pistols. The AR-15, when in well-trained hands, is one of the most capable weapons systems ever designed. 50 Cal. 1 2 3 Next Page View All View All. The BCA upper would not fully seat on the PSA lower. Please login or register. fxzt wgyoap dbgs uuvzsx fxrjyeuk vvwc crevvso gzwmhwgj subpc vpdftt gyhel iofblto swx zlrcry putxmr