overbarrels have very little volume in the rear section unless you go quite wide, weight/volume ratio is less efficient, can't be swapped between multiple guns (as made by most NZers anyway), also trap heat in the barrel etc
overbarrels have very little volume in the rear section unless you go quite wide, weight/volume ratio is less efficient, can't be swapped between multiple guns (as made by most NZers anyway), also trap heat in the barrel etc
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