I removed my flash suppressor last night and a washer fell out. I didn't expect it to be in there so it just popped out, and consequently I didn't get to see how it fits. The washer has one beveled edge. I assume the bevel faces forward to self-center the washer, but can someone confirm?

Thanks,

Dan

If it is a crush washer the small end goes against the muzzle... but there is no need for a crush washer. Just lightly snug tighten.

There's a lock washer on the M16/AR15 flash suppressor or compensator. The original M16/M16A1's flash suppressors used a regular lock washer; the M16A2 uses a compensator that has to be indexed with the closed slot down and originally used a peel-washer. Literally peeled off layers like an onion to get the right height. The latest lock washer is a crush-washer and is tightened until the compensator is properly aligned.

Since the M&P15-22 uses the "A1-type" flash suppressor no indexing is required. I'd still use the washer, though I doubt the flash suppressor is going to come loose. You'll need it if you put the "A2-type" compensator on (common gun show part).

-- Chuck

Did the washer fall out of the FH, off the back of the FH or off the threads of the muzzle? Pic please.

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My mistake. It wasn't inside the suppressor, but was indeed the crush washer.

Question: I just received a AR-15 armorers tool and I noticed the A1flash suppressor on my MP15-22 is smaller than the A2 on my MP15. I always thought they were the same size!