Definitely a 363mm.
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Sam Pascoe
i couldn't find a 330 for mine so i bought a 363mm and a suppressor to cover it
(also i recommend getting the Prometheus purple bucking to go with it, they go hand in hand)
Happy Christmas
(also i recommend getting the Prometheus purple bucking to go with it, they go hand in hand)
Happy Christmas
Hudson
Ak2M4 do 340mm tightbores if that's of any use?
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Sam Pascoe
yeee you could do, i don't think losing a few mm would have any change on the performance of the gun 
been told different things, 363mm, 318mm or 400mminner barrel