Gas Port Sizing 18.5"

[KYBulldog]

AR10 armalite upper/lower, prs with rifle buffer(armalite) custom barrel

planning .875 gas block- block type unsure, will probably start with larue tactical. Can anyone tell me what size gas port for rifle length gas system on this length barrel?

[robtmc]

Can only say what the 18.5" Fulton Criterion barrel  is.  .093" or a #42 drill.  Can't say how well it cycles in rifle length, have not gotten the gun to the range again.  That said, drilling a partly blocked .093 carbine hole to .097 gave perfect function, to the point that the JP adjustable block could be turned way down to limit brass throwing.

New JP trigger waiting to be installed, will not make the crappy trigger mistake again while trying for group size.

Can anyone tell me what size gas port for rifle length gas system on this length barrel?

[survivalshop]

Can only say what the 18.5" Fulton Criterion barrel  is.  .093" or a #42 drill.  Can't say how well it cycles in rifle length, have not gotten the gun to the range again.  That said, drilling a partly blocked .093 carbine hole to .097 gave perfect function, to the point that the JP adjustable block could be turned way down to limit brass throwing.New JP trigger waiting to be installed, will not make the crappy trigger mistake again while trying for group size.

I'm confused with that statement . What rifle are you talking about , The one you haven't shot or another one ?

[robtmc]

Typing too fast.  The old barrel was 16". .063, opened to .067.  That one worked great opened up.

The 18.5" is unfired, has a .093 port, hopefully plenty large.

Will engage brain next time.............