I was looking at one of the mk3 threaded/lite uppers on GB and wondered if I can switch that upper to my mk3 hunter and use my existing bolt (it doesnt come with a bolt)? How are the mk3's headspaced?
I live in a free state and want to run a can on my mk3. The upper is much cheaper than a new threaded gun (400 vs 165)
I live in a free state and want to run a can on my mk3. The upper is much cheaper than a new threaded gun (400 vs 165)


Bob B.
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