Thread: Modifying a suppressor

Have a Waitaki 223 stainless can in 1/2x28 surplus to requirements, which got me thinking that it's just the right thread to go on my 9mm AR if only it had a bigger hole down the middle. Would it be possible to just stick it in the lathe and jam a 10mm bit down it, or is it a bit more complex than that? It's a one piece setup and I don't know how the baffles are affixed. Or should I just sell it and chuck the cash towards a proper one?