GSI APFG MCX Hop-up Arm

WARNING - PREORDER NOW - END DECEMBER DELIVERY 

GSI hop-up arm for the APFG MCX. This replaces the stock hop-up arm that can cause BB overhop on the lowest setting. Fits the MCX Rattler and Legacy. 

The GSI arm has better adjustment and allows an aftermarket nub to be installed into the arm.

The arm already comes with the GSI red (hard) nub.