Cybergun FN Herstal Licensed FNX 45 Tactical Airsoft Gas Blowback Pistol by VFC (Color: Dark Earth) speedqb MP5 Picatinny Stock Base Buffer m4 magazine pouch MP5 Picatinny Stock Base Buffer Tube Adapter Set●20mm Picatinny Stock Base and Buffer Tube Adapter Set●Unlimited customization options with the M4 buffer tube conversion●Freely adjust the height for the best sight lines when aiming FeaturesInjection molded polymer body is lightweight but can withstand the rigors of field useEasy to use winding mechanism ensures proper feeding400 round capacityMetal magazine stemEasy to fill designProvides more firepower than standard extended magazinesHuge gas reservoirCompatibility: For WE Open Bolt GBB M4 M16 and other compatible gas riflesMaterial: Polymer 8lbs)Muzzle Velocity: 300~320 FPS (Measured w 0 double single action triggerImproving on the FNP™ 45 Tactical