Why are you making it hard on yourself going with 5.45x39, especially now when supply is short? Why not go with 5.56?
I suspect you'll end up with carbine length gas and a standard weight or maybe H buffer. But I don't have first hand experience tuning that caliber in an AR.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek
Last edited by Quentin; 03-16-2013 at 02:18 PM.