 The MAC-10 and MAC-11 were 1970s blowback designed weapons with the magazine in the pistol grip and a fire selector switch.The .45 ACP MAC-10 had a 1,145 rounds per minute rate of fire, and the 9×19mm version 1,090 rounds per minute.The MAC-11 could fire 1,200 rounds-per-minute with its .380 ACP cartridges.