JM Gen8 Gearbox — Full Nylon Replacement for JinMing M4A1, SCAR, UMP45 & More Type:new (semi / full auto) FMA series mask the lightweight

FMA series mask the lightweight of the new type of carbon material

it's the ultimate choice for foam dart enthusiasts

the position can be adjusted up & down

which is also a pretty good way to play

Its popularity stems from the integration of the JinMing Gen8 gearbox

JM Gen8 Gearbox — Full Nylon Replacement for JinMing M4A1, SCAR, UMP45 & More Type:new (semi / full auto) FMA series mask the lightweightThis is the famous Jinming Gen 8 Gearbox, it's full nylon made, reliable and durable. This is superior to the old one with metal bushings and nylon gears. But most importantly a harden nylon shell. Compatible with JinMing SCAR JM Gen8 M4a1 HLF UMP45 JM MP5 JM Gen13 XM316 blg m16 ZH m249 and other gel blasters using gen8 gearbox. Features: Full Nylon Construction Hardened nylon shell, gears, trigger, T piece and motor housing for superior durability