Sig Sauer Airguns AIRMCXCANEBRAKEPCP: SIG Sauer Airguns introduces the SIG Sauer MCX Rattler Canebrake .177 Cal. CO2-powered pellet. The MCX Canebrake .177 rifle comes with a metal receiver, paired to a synthetic handguard with an integrated M-LOK modular locking accessory mounting system, flip-up sight on top of a full-length Picatinny rail, and a shrouded barrel. The 177 cal. MCX Rattler Canebrake keeps you on target longer with fewer reloads utilizing its 30 round SIG Rapid Pellet magazine.