Adjustable 3D Print Hop Up for JM Gen13 SJ M4 MK18 The suit has thickened pearl

The suit has thickened pearl cotton and EVA soft rubber lining inserts in the front and back bulletproof board

Type: standard / glow in the dark

Once in programming mode

the pistol design direct load a rival foam ball into the front of the barrel

Adjustable 3D Print Hop Up for JM Gen13 SJ M4 MK18 The suit has thickened pearlThis adjustable 3D print Hop Up is compatible with the SJ M4 MK18 and JM Gen13 gel blasters. Improve your accuracy and precision with this professional grade upgrade. Easy to install and use, perfect for gel blaster enthusiasts and experts. Don't settle for less, upgrade your blaster with this hop up today. Good for jm gen13, sijun sj m4 and sj mk18 gel ball blasters. Specifications: Brand: DK. Material: 3d print. Color: black. Length: 50mm. Outer