AR-15 Compensator Shims ~ Muzzle Device or Muzzle Break for MSR

[@musicman1eanda]

Which side of a shim do you slide onto your AR barrel first when attaching a muzzle device? The flat side, or the slightly rounded side?

[@TriggerShims]

Generally any rounded crush washer I would put the flat or concave / depressed side on first.

[@anthonyshepard9606]

Where do you get the plain barrel washers from? 5/8-24, AR-10