Aractain had pointed this out up in the live gameplay discussion forum. You can test it yourself by seeing how many bullets it takes to kill the dummies; it goes up by 1 with the FART attached. It also takes around 10 extra rounds to kill a MAX suit. I knew there had to be a catch - so not only is the attachment almost completely useless, but you have to give up extended mags to use it. On top of that, we also get a drop in damage per mag and nearly the exact same DPS as the bone-stock weapon. 800*143 = 114,400 / 60 = 1907 (rounded) 920*125 = 115,000 / 60 = 1917 (rounded)** You gain nothing from equipping the FART besides a faster spinup time. Overall, you actually lose more than you gain by using it. Thanks, SOE. What a surprise. **920 RPM seems to be the tested rate of fire of the MCG with the FART attachment equipped. If anyone has a better/more accurate number, throw it out there. Or SOE could just give us the damn numbers themselves.