The Umarex AER16 is a .177 caliber BB-firing airgun powered by an 11.1V tri-panel 35C LiPo (lithium polymer) rechargeable battery. This electrically operated airgun offers both semi-automatic (single-shot) and fully automatic firing modes. The product includes a 55-round magazine, adjustable stock, M-LOK compatible handguard, integrated flip-up iron sights, and a full-length Picatinny top rail for mounting accessories.