The Zion Arms R&D Precision AEG is an officially licensed 1:1 scale authentic replica that offers the same look and feel as well as functionality as the real steel counterpart 10 inch M-LOK handguard that provides ample space to mount lights, lasers, and other M-LOK compatible accessories The handguard features QD sling mounting holes on both sides of the handguard to give users the option to mount on either side The reinforced redesigned metal version 2 gearbox has ultra-smooth 8mm bearings, 18:1 steel gear, steel teeth, polycarbonate piston, bearing spring guide, rotary hop-up, and a 19k RPM neodymium magnet high-speed motor that provides consistent performance This gun features Zion Arms' fully programmable electronic trigger unit that can be programmed to shoot in varying burst modes Low resistance wiring prevents potential damage from the battery Copper polished 6.03mm tight bore barrel improves range and accuracy (200+ feet with 0.20g BBs) The full metal gearbox features a quick change spring design that is accessible through the rear of the rifle This variation of the PW9 now comes with a delta stock and buffer tube which allows for the ability to fit bigger batteries The Mod 1 design also removed the front charging handle and now uses a standard M4 style charging handle to reveal your hop-up unit Full length 20mm top picatinny rail that allows users to mount optics, lights, lasers, and PEQ boxes Paired with the Zion Arms' electronic trigger unit, it uses a flat trigger and enlarged trigger guard to help with feathering and rapid firing on semi The ergonomically designed polymer texture grip enhances your grip and feels great for long game play Fires in full-auto, semi-auto, with a functional safety (Can be programmed to shoot in burst modes)