Another new release from SPEED Airsoft designed to help you use the low-cost propane for gas blowback magazines and airsoft guns... "SPEED Airsoft releases a professionally designed Premium Propane Adapter for GBB rifles and pistol magazines, which comes with a durable CNC turned brass injector tip. The SPEED Premium Propane Adapter (Part #SA3300) is CNC precision machined from USA grade aluminum, and is fully anodized for high wear.