A little trouble - Phase 5 Weapon Systems Inc 90 Degree Ambi Safety Selector AR15/AR10

First of all, this looks great on the build. It also feels really good. There's more room to catch your thumb on than the regular ones. However, I had a lot of trouble the first time I attempted to install it; I just could not get it to work. It went in fine, but then I couldn't switch it between fire & safe. I had the same issue in 2 different builds. I still don't know exactly what the issue was, but it finally worked in the 3rd lower I put it in. To be honest, it was more trouble than it was worth. Ultimately it worked and has a great tactile snap.