07-06-2021, 04:52 PM
You have an SA gas block so wide open is actually the middle position. Start there with a std spring and Buffer. If your mags are working good and I suggest a cpd 10rnd Grendel mag, the rifle should run with a little gas tuning. Load 1 round fire and see if it locks back. If not you are likely undergassed. If it locks back. Close gas a few clicks and repeat until your happy.