The Sig Sauer MCX RATTLER 4.5mm Cal 12gr CO2 Steel BB Gun w/30rd Mag & Flip-up Front/Rear Sights AIR-RATTLER-BB is a realistic and powerful air rifle designed to replicate the feel and function of the MCX Rattler firearm. This CO2-powered air rifle features semi-automatic and 3-round burst firing modes, an internal blowback action for felt recoil, and a functional charging handle and bolt catch for realistic reload drills. The 30-round magazine houses the 12g CO2 cartridge, while the M-LOK accessory rail and full-length Picatinny optics mounting deck provide versatility for customization. The fully adjustable flip-up sights ensure accurate targeting, making this air rifle ideal for training and backyard plinking.