Something went seriously wrong at pws for this to happen... - Primary Weapons Systems MOD 2 FSC Series Flash Suppressing Compensator

I was excited to put PWS' matching FSC muzzle device on my MK116 Pro, only to realize that the threads wouldn't even start on the barrel. Puzzled by this, I had it tested with a ".5000-28" thread plug gage, and the gage wouldn't even go on. Normally I would chalk this up to my particular example being a lemon, but the severity of the quality control issues makes it impossible for me to recommend the FSC to anyone. I'm not really sure what happened here, PWS makes fantastic long-stroke piston rifles and most of their other products have been stellar in my experience.