I'm sorry I can't help.
BUT, I can say I have a beautiful 5.56 NATO Rock River lower and Bravo Co. upper carbine with a short stack 1x7 twist holly double pumper gas carbine with a magpul flip sight dual quad rail zip line free throw stack duster through a barrel jump slap trigger and a hairpin top stopper. The bolt-action carrier group blasts a brass ringer like a virgin belly flopper on a Minnesota firefly puddle, and slides in that sprocket like two-cent whore on nickel night.
You get it's pilot lit and it'll suck start a leaf blower.