so, i've been around weapons for quite some time, and built a few when time and money has permitted.

i know my way through most weapons and, until recently, considered myself somewhat of a shade-tree armorer until the other day...

what the hell direction does a crush washer go on!? is it convex side toward the barrel, convex side toward the flash hider, or does it matter...?

i grew up in a ban state and never had the opportunity to install any muzzle devices with one. so this weekend i recieved a new barrel kit, and sat [stupified], at this seemingly insignificant piece of hardware.

help!

Upper receiver   <  Flash hider

Where < represents the crush washer and the way it looks.

cool, that's the way i was going to put it on, but i wasn't sure.

thanks

+1, but I fail to see the stupid question, or is it the one you did not ask and screwed something up?