I've got a MAK-90 that I've had for about 16 years. Most of the time it's sat in the safe, just waiting for the day when the kids would be bigger and there might be more funds available for the fun projects. I have decided to thread the barrel so I've bought the tools and the flash hider I want to put on it, which is the Liberty Cans Phoenix. My question is this. Will I need to use a crush washer on this installation? It looks quite similar to the Vortex, and since that flash hider is supposed to be self-tightening, I'm wondering if the Phoenix would also be. Any info would be a help.