in order to keep it simple you will have to limit some options. other wise your guy will have 50 different barrel types to make and keep them identified for separate buyers.
God created Police so Firemen would have HEROES
In God we trust, everyone else gets searched
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