Mtn.Man, I'm curious how this works....
Originally Posted by Mtn.man
Colt 5.56 upper, RRA lower
Rock River Arms lowers have the small diameter pin holes....doesn't Colt use large pins or has that changed? Exactly which parts on the upper are Colt vs. aftermarket?
What bolt carrier group does the upper have in it? Full circle rear or half circle rear? A1 or A2?
Also wondering what configuration the upper is....is the barrel 1:7, 1:8, 1:9, or 1:12? Is it an A2, A1 or a flat top upper? Does the barrel have M4 cutouts? Is it a lightweight, midweight, or heavy barrel? Is it pre or post ban?
When you say it's free floated - does that mean it's in a DCMP configuration with a full fore-end or is there a rail?
I've got a friend that may be interested (pictures would help). Thanks.