Thanks.....I decided to chase this up with GM as their latest round of pictures shows M4 ramps seemingly also on the rifle length barrels. I got this response, thought I'd post it incase anyone else stumbles across this while researching barrels:
"Thank you for visiting Green Mountain Rifle Barrel Co’s website and contacting us. Item # GM-M16 does have a M4 Extension"
-so it seems they must have changed this since you got your barrel. Good thing IMO...not because the rifle barrel particularly needs them, more for the fact that 90% of stripped uppers you find all come with the M4 ramps these days. Going to pick one up soon.
Last edited by SA80Dan; 08-04-11 at 13:15.
Dan
Makes sense, since mine is on an A2 upper.
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