So the Griffin BCG arrived yesterday. Everything looked good, everything was in spec. I was impressed how not needing any cleaning to remove factory preservatives yet I still did it just in case. Clean as a whistle. Lubed, reassembled, and took the Microbest BCG out and replaced with this one. She functioned fine until she didn't, and was getting stuck in the rear occasionally. I looked over everything, nothing came loose with the extension and my staking and TDP torquing was still perfect, nothing was broken with the catch either, so charged it all the way back and it was where it was supposed to be. I measured this BCG with the Microbest BCG that was in it and they were both the same lengths.So on a hunch, I took the upper off this rifle and put my SBR lower with the Tubbs flat wire and it functioned as it was supposed to. So I promptly ordered one for this lower and will be replacing the one in it with the Tubbs. It still works as it should but I am now not feeling it like it is super dependable for the moment. I fed it mag after mags of dummies to manually charge and eject and all was as it should be. However push it all the way as far as it can go and it stays there unless given a slap on the back of the stock. It's not a free flow can on it despite being advertised as low pressure it's has a slight noticeable back pressure that I am concerned with this getting the carrier stuck at a not so great time to be stuck during.I'll get this sorted. It's what I do.