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.

M140S upgrade spring for airsoft AEGs. Not compatible with the Tokyo Marui PSG-1.

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

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

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

Systema M130 spring upgrade for AEGs. Most AEGs will be around ~430fps with this upgrade. We recommend upgrading to metal bushings and reinforced gearbox for v2 AEGs as well.

Systema M150 spring upgrade for AEGs. Most AEGs will be approximately 490fps with this upgrade. We recommend this spring only for those experienced in airsoft upgrades.

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.