Crosman C11 BB Mag, 18-rd Stick, 2/Pack, Fits C11/C21/C31, Beretta Elite II & S&W M&P 2 stick mags for the C11, C21, and C31 BB pistols plus the Beretta Elite II and the S&W M&P Each holds 18 steel BBs Made for STEEL BBs (Does NOT fit the C11 airsoft pistol!