Internal Parts / Upgrades

The GSF Enhanced Hop Up Chamber for the M4/M16 Airsoft AEG is constructed from a high quality metal to ensure a proper air seal as well as a consistent pressure on the hop up bucking. GSF Airsoft parts are engineered for high performance and durability...

The GSF 18:1 Standard Gear Set for Airsoft AEGs is constructed from high quality steel - not pot metal. GSF Airsoft parts are engineered for high performance and durability without a hefty price tag, offering the consumer great parts at a great price. ...