porting like the disruptive barrel has really worked to quiet the shot for me. holes get larger as they get toward the barrel tip. 4 6" rows of porting. would be interested in knowing who is making them and how tight are their tollerances.
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9mm will make you weak!
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CCM Works Sniper, Thumper, Kingman Hammer Low Pressure with Vertical ASA, TPX, Ion mech/closed bolt