If you want to TURBO CHARGE your M11 to put a smile on your face, this drop in rate accelerator is what you have been waiting for. The Tactical Innovations Inc MAC JACK™ lets you run your ordinary M11/9 SMG at MICRO UZI FIRE RATES. This simple innovative piece drops into the rear of the upper receiver and by short-stroking and bouncing the bolt your M11 will achieve speeds in excess of 1800 rounds a minute and speeds over 2000 RPM have been claimed by users. The variation in speed is due to the buffer thickness that is in the gun, the ammo used as well as the grip of the shooter. Felt recoil is greatly decreased due to the short stroke and no modifications are required to the gun. User tests with drums have reported that the drums have difficulty keeping up with the gun at MACJACK™ speeds. However, sten converted M11/9's with a 50 ROUND LANCHESTER work perfectly. Why buy an M11A1 .380 gun when you can get the same speed from you M11/9? In today's C3 world, the MACJACK™ is way too much fun for so little money!