Are the Colt 6920 flash hiders just screwed on, welded on, single-pinned with weld, double-pinned with weld, or silver soldered on? Thanks.
Threaded on–no reason for permanent attachment on a 16" barrel.
Threaded on, torqued in place with a crush washer.
Thanks guys. Is any sort of thread locker used when the muzzle device is threaded on or is it just torqued to spec with the crush washer?
We’ve only used the crush washer torqued to spec with no failures. We only use Rock Set on suppressor specific muzzle devices. FYI, the common thread size for AR’s is 1/2-28.
Just an FYI- when using a crush washer there is no torquing involved. The flash hider is simply tightened down until everything lines up. Torque is required when using the old flat type washers.
You are correct sir. I miss spoke about the torque, we do in fact just line up the brake to the correct orientation, just a little loose on my use of the term torque setting!
can somebody please explain how a crush washer works, thanks.
The crush washer compresses as you tighten the flash hider. It has a tapered internal shape that allows a small amount of deformation and locks the flash hider in place from the applied compressive force.
Just an FYI- when using a crush washer there is no torquing involved. The flash hider is simply tightened down until everything lines up. Torque is required when using the old flat type washers.
Correct. I should have paid better attention to my terminology. The crush washer is designed as a one time use item, which is tightened down to TDC.
I may be misremembering, but isn’t the crush washer meant to be essentially a field expedient for measuring torque? That is to say, the washer is designed so that it requires a set amount of pressure (generated by the proper torque value of the FH) to crush the washer within a certain rotational range (IIRC, it’s something like between 120 and 460 degrees rotation, but do not quote me on that). The crush washer itself does nothing to hold the muzzle device in place, but it allows you to time that device and know you’re within proper torque limits.