Replacement Version 2 gearbox for SRC AEG.

Broken your stock Marui V2 gearbox? Looking to upgrade? In either case, you'll need one of these as a replacement!

UTG's gear box assembly for UTG M14 style airsoft rifles.  Also works with TSD Tactical M14 airsoft rifles.This product is the core gearbox assembly and includes all components inside the shell.  For replacement, additional disassembly is not required.

Matched Gearbox by Bravo Airsoft Heat-treatedPrecision 8mm Bearing wellsStandard Japanese 8mm Bearings 8x3x2.5mmHard-Coated with Trivalent Chromium (Cr III)Gearbox features high impact tolerance, durability, and strength making it perfect for your super high-speed and super high-FPS set ups.

Reinforced metal gearbox (Version II) For MP5/M16/G3 Series AEGs.

Echo1 M16 Complete Gearbox with MOSFET 7mm Reinforced Gear Box ,7mm Bearing ,Metal SPring Guide ,Metal Gear Set ,Metal Tooth Piston Body ,Alum. Cylnder ,Ported Polycarb Piston Head ,MOSFET LOW Resistance Wiring Harness (to the back/ M16 style) ,

The Echo 1 replacement gearbox for Echo 1 M4 style airsoft guns.  This is a complete gearbox, fully assembled to be a drop in replacement for repairing or upgrading your Echo 1 M4 or other front wired airsoft guns which are wired to the front and require a Version 2 gearbox.  *If you have any questions regarding this gearbox, please contact us prior to purchase.

The ICS Olympic Arms M120 Power Up Kit is a bore-up kit for your ICS M4 and M16 style airsoft rifles.  This kit includes everything you need to built an upgraded upper for your ICS rifle.  It contains the upper gearbox (MA34), an M120 spring (MC39), metal spring guide (MA46), tappet plate & spring (MA50), bolt (MP23), oversized piston head (MC56), aluminum piston (MC05), oversize 4-port cylinder (MC58).*CLEARANCE*

This is ICS's "Upper Gearbox B" reinforced M120 Upgrade Kit.  This kit includes all of the parts needed to build out a fully reinforced upper cylinder for your ICS PCR-97/M4A1/M16 type airsoft rifle.The kit includesn all of the following parts:ERICSMA34 Upper gearboxERICSMC39 M120 SpringERICSMA46 Metal spring guide(II) with screwERICSMA50 Tappet plate and with springERICSMP23 BoltERICSMC19 Piston headERICSMC05 Full teeth aluminum piston*For ICS series M4/M16 type AEG's only.

Complete Version III Gearbox Set for SRC SG-Series AEG without motor and motor cage.  This is a drop in replacement for the original SRC SG series airsoft rifles.  Just replace your motor and motor cage, fine tune the motor depth for best performance, and drop it right in!Note:  Gun is picutred with motor and motor cage attached to gearbox housing.  This product is for the complete gearbox only and DOES NOT include the motor or motor cage.