Hey all, just finished my lower build.
Anderson stripped lower, with LPK from unbranded, buffer and such from gun broker ect...
All went well and went in easy, but I throw my 350 upper on it for a quick functionality check and it won't open the bolt but maybe a 1/3" and stop... What could be my cause (don't beat me up too bad, I'm still new to the AR platform lol)