I have a few different kinds, a JP on my 308 precision AR, POF on my 10.5 SBR, Govnah on my 11.5. When I built my 7.5, and new i was going to want a adj gas block. After trying to figure out what $100+ one I wanted, I stumbled upon the JOE BOB adj gas block. It was about $25. I was really...