DK Adjustable Hop Up for JM M4A1 J9
- Hop Ups Increase Firing Distance and Improve Accuracy by Applying Back Spin on the Gel Balls as They Leave the Barrel.
- High quality DK Hop Up
- Fully Adjustable
- Perfect fit for M4A1 J9
- Fit to end of barrel with flap on top
- Tighten grub screws
- To increase lift, simply adjust by turning grub screw clockwise to increase angle of the flap.
- 1 x Hop up