Most flash suppressors get installed with a crush washer.
You remove the old muzzle device and install the new one.
Small end of the crush washer points towards the gun, large end towards the muzzle device.
You simply tighten down the muzzle device until it aligns correctly.
The crush washer will crush as required.
You want to have at least 90 degrees of crush.
If you don't have that much when you first start tightening, go around another turn.
Then there are peel washers.
These are a stack of shims.
Use a lighter to de-laminate one side of the stack.
Then you can "peel" away as many as you need to obtain proper alignment when the muzzle device is tightened.
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