This rifle is compatible with SDERBAT22 & BAT12-mini AEG batteries Features: Semi/full automatic Weaver/Picatinny rail system (RIS) Folding, retractable buttstock Flip-up front sight Adjustable flip-up rear sight Metal gearbox Adjustable hop-up Metal upper receiver Polymer lower receiver Several attachment points for QD Sling Mount Use with 1, 2 or 3-point slings Compatible with version 2 AEG upgrade parts 30-day, limited warranty!