Pommy is right. They can go on in two places. Mark one and always start it in that orientation. Groups may not open up, but may shift slightly. Make sure the bush has clarence form touching the barrel. They do seem to be able to move a bit. Do put some thread lubricant on the baffle threads. Do not tighten them more than just touching as they will be a pain to separate. Take them apart as often as you can. You will soon learn to feel just how much to tighten each section without them jamming. Just check periodically during shooting. Same when putting the suppressor on the barrel a-lock. Let the suppressor cool right down before trying to remove off the barrel if you're having trouble when it comes time to take it of when you've been shooting. I have one and after a bit of frustration, these simple rituals have meant no more annoying instances.
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