Anybody Ever Run There Ar Without The Buffer Retainer Pin/spring? in Rifle - Technical Posted November 6, 2019 I've had a well used Palmetto State A2 rifle lower lock up 3 times and not be able to cycle. After I got it apart, the buffer retaining pin had stopped retaining the buffer. The stock screw to tighten it had worked loose. I always thought that pin had to be there. I'll have to take another look at this one and see exactly what was causing the stoppage. It wasn't an immediate action type of stoppage, it was a broken gun type of stoppage. Interesting, I'll revisit that one.