shaving fractions of ounces at the middle of the gun isn't going to do much to affect overall feel. you need to lighten the front end. cutting the 16" down to 14.5 and perming a FH will be a start.
why 4 batts in the gun? why not 2 if you need them, and the rest on your gear?
try a MOE stock and put 2 CR batts in hand grip and/or duct tape a 2032 to a flat spot on your stock...




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