Just to steal this thread
Is a 6.5 CM just a barrel swap if I have a G1 rifle in 308?
Yes - basic barrel swap should work.
Depending on the 6.5 barrel you get, the barrel shoulder profile by the barrel extension "may" interfere with the barrel nut. IE, the barrel nut may be a tight fit over the shoulder to get it to screw onto the upper receiver. I've seen this with a Ballistics Advantage 6.5 barrel and a DPMS barrel nut.
