shucks guys, thanks. Jgun: its a miculek brake. i didnt glue the tube on there, just pounded it on and its stupid tight. to be honest im thinking i might have to cut the damn thing off if i ever decide to go back to the larue. it has a carbine length gas tube with a "modded" (read hacked) standard sight post gas block. and the tasty RRA 2 stage trigger. might be neat to grab one of those DPMS carbon tubes from JSE for my .308. then id have twins and could name them danny and arnold.