This is my MAR-4 (Masterdude Assault Rifle version 4). Upon request of fellow members of the K'nexing community here, I have made it using a new firing mechanism (firing pin/ramrod type). It fires my standard ammo, however if you are doing single shot then it will shoot blue rods, and others if you load down the barrel.
-Can be breech loaded
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Image 1: Gun with optional gear.
Image 2: Gun without optional gear.