More range testing yesterday and some interesting failures. First of all the fore grip almost fell off after the screw tried to make an escape. Not big deal. But several FTF and looked like light primer strikes. Seemed like they were somewhat off center too, more than I’d expect. Then noticed the ets mag was causing a lot of these ftf, but the glock mags were not. Also had one round not fire, and was stuck in the chamber and wouldn’t extract. We even cycled bolt many times and it would not light off. Had to dig out the round with a screwdriver, wasn’t overly stuck in there really, but the extractor couldn’t grab it. Almost seems like the adjusting nut wasn’t holding the chamber and barrel far enough into the receiver, but I checked the nut and all was tight. Could my spacer ring be too thick? I don’t have a 9mm headspace gauge unfortunately.