Retro Arms CNC Hop Chamber AR15 PRORetro Arm's new variant of their hop chamber , the Pro series comes packed with modularity ! The all new Pro hop chamber comes with an adjustable bb feed tube which makes fitment with magazines a dream. What is included? CNC Hop Chamber Adjustable BB Feed Tube 5x Shims for Adjustable Feed Tube Rotary Dial 1x Flat Hop Arm 1x Flat Hop Nub 1x M style Arm C Clip 3x o rings, Gearbox seal Rotary Wheel BB Feed tube retention Threaded barrel collar Real Deal
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