Quote Originally Posted by Don - LongRangeSupply View Post
I have had to cut more than one crush washer to get it off of a barrel when it has been flattened enough to be smaller on the inside diameter than the OD of the threads.

Fortunately every one I had to do that with had enough room between the shoulder on the barrel and the threads that I could fit a pair of angle cutters over the crush washer to cut it.
Same thing here for a slew of AR-15s. Once you start trying to get some pliers on the washer to unscrew it you can warp it even more... I have used a dremel to cut away most of the material and then some cheap diag cutters to carefully nibble away until I can turn it into a split washer. Maybe use a peel washer to install the brake next time...