Hi-Capa 5.1 from WE is a full metal semi-auto replica, with a strong blowback. The Hi-capa improves on some important features of 1911-series pistols. Mainly improvements are groves on the slide, high visibility iron sights, ambidextrous safety lever, high capacity magazines, Picatinny accessory rail and thread in the barrel. The Co2 magazine hold 30 bbs.