Classic Army's 300% spring for AEG's. Approximately 500fps w/ .2g BBs.

The gearbox spring set contains all the springs that are inside your Classic Army, ICS or Tokyo Maru gearbox.

Presented by Laylax, the First Factory PSS2 110SP spring for the Maruzen APS2 and Type 96 bolt-action airsoft sniper rifles. Note:  Spring not compatible with AEG type airsoft rifles.

Mad Bull Regular Pitch Upgrade Springs for airsoft AEG's.

Systema M110 Spring exclusively for Systema Revolution gearbox and Systema Professional Training Weapon System (PTW) airsoft rifle.  Estimated muzzle velocity is approximately 360 Feet Per Second.*Not compatible with non-Revoution or non-PTW gearboxes.

WE OEM replacement sear spring for WE Hi-Capa and 1911 style airsoft pistols.  Also Marui compatible.

All interal springs for ICS gearboxes.  Also compatible with many other brands.

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.

KWA M120 AEG spring for AEG airsoft rifles.

Systema M100 spring upgrade for AEGs. Most AEGs will be around ~350fps with this upgrade. We recommend upgrading to metal bushings as well.