GtoRA2: Miko,
How large a caliber change can be done? Will it be able to go all the way up to 7.62 nato?
I have never seen a specific info on that one.
I believe that the best military round would be not a .308 (7.62 NATO) but a .243-.250 ( 6.2-6.35mm) with a 90-105 grain projectile shot at the same velocity.
The weapon design looks nice for a person who likes to play with parts. Having a spare 20 inch barel to swiftly replace a hot one or for long-range shooting would be nice.
miko