Specifications Brand: WE-Tech Operation: Gas Blowback Power Source: Green Gas / Propane Firing Modes: Semi-Automatic, Full-Automatic, Safety Muzzle Velocity: 300 - 320 FPS (w/ 0.20g BBs) Magazine: 25 Rounds (Compatible with G Series Magazines) Hop-Up: Yes, Adjustable Product Dimensions: 220mm x 146mm Overall Weight: 1.5 Pounds Color: Black Features Full metal Ruger MK4 slider and barrel assembly with high strength polymer G-series style lower frame Top 20mm picatinny rail with included detachable rail segments for mounting optics and other picatinny accessory Threaded outer barrel that allows you to mount compensators or suppressors Fiber optic iron sights similar to the ones on the Ruger MK4 firearm Selector switch is hidden underneath the bolt Package Includes: 1x Gun, 1x Magazine, 1x Manual