Maple Leaf Hop-Up Plus Inner Barrel Set for GHK M4
● Material: Nylon fiber, rubber, and metal made.
● This is the GBB spec barrel, which needs to be assembled Maple Leaf Hop-up to fit GHK M4.
● This item includes hop-up set, and GBB type silver 6.03 inner barrel (not the Crazy Jet version).
Specification for M4 series, 3 types of size for choice:
GBB type M4 370mm (14.5", MOD2) / 310mm (12.5") / 275mm (10.5", MOD1)