Model: SR30 M-LOK Hall: Metal Guards: Metal CNC - Hard Anodizing length: 675mm Weight: 2760g Bearings: 8mm Motor: 18000rpm inner barrel: Brass 245mm (diameter 6.04mm) Chamber of Hop Up: Plastic rotary type Charger: 90R speed: 100m / s type: AEG Wiring: 16 AWG Head brass cylinder: Aluminum piston head: Plastic piston: Metal teeth Electronic Trigger: Yes MOSFET: Yes Spring guide: Metal antifriction