January 31st, 2007, 08:39 PM
Join Date: Nov 2004
First remove the small allen stop screw on the top of the Flash suppressor. then using the Castle Nut pliers unscrew the castle nut the FS will pull straight off.
If you don't have the pliers you will damage the castle nut and proably scratch up the FS in the process, poss. damage the threads on the bbl if he uses a punch to spin the castle nut. I have seen this alot and it is ugly. there is a guy on ebay that sells the pliers you will need, they are about $19.00 for the heavy duty ones. also can get a set from brownells.
I had a set of usgi pliers and I bent them removing a stubborn nut from my poly.