I caught up with a 3 gunner this weekend, who is putting the MKA through its pace's. He said he has already had to do some work to it to get it to sometime function. The picitiney rail on top was way out of spec, & the gas system doesn't seem to seal all of the way. He has not shot heavy loads through it sense he just shooting 3 gun with it. He is still has not seen anything available out there as far as after market mags to up the capacity......