M&P 15-22 barrel diameter

[chuck s]

My barrel blocks don't fit the barrel well. The crush washer is just there to fill the gap and as a lock washer of sorts. And not excessively torqued. No need to index the "birdcage" compensator.

Peel washer was a PITA for indexing but once done it was done. You can save the peels if you want to change the index it it's not right. Peel washer is certainly a labor savings when indexing.

-- Chuck

 

[AR15barrels]

AR15Barrels,

Crush Vs. Peel, is there any preference, any reason to chose one over the other? Are the Peel Washers reusable since they don't "crush" ?

I would recommend a peel washer in this instance to reduce the amount of torque required to index.
No problem re-using a peel washer.

I would also shy away from a crush washer even WITH the use of barrel vise blocks because 22 rimfire barrels tend to be much softer steel than typical 223/5.56 barrels and you can stretch the barrel right at the thread relief while crushing a crush washer.
The only way I would use a crush washer on a rimfire barrel is if I pre-crushed or ground the washer so the muzzle device only needed to be tightened about 15-20 degrees to final index.

 

[BELT_FED]

well said not to mention you can break the upper without barrel vise.. a wayfer washer or a peel washer is the way to go on these little rifles