Stoeger STR-9 Compact Black 9mm Luger Handgun Magazine - 10 Rounds - STR-9 Compact Magazine, 9mm 10 Round with Pinky Extension. Produced from steel with a black finish and a durable black polymer base, this mag is capable of holding 10 rounds of live 9mm ammunition for the STR-9 Compact pistols Caliber: 9mm Luger Finish / Color: Black Magazine Capacity: 10 Models Fit: STR-9