This is a factory replacement 9mm barrel for your MPA 9mm 30 & 35 series. After thousands of rounds and your weapon's accuracy is a bit off, it may be time to replace your barrel. This easy installation with the use of one of our McWrenches and a new barrel spring pin will give you the performance you can expect from your SMG. Barrel thread is 3/4x10. Does not fit MPA Mini 930.