Bingo Airsoft Designs posted on Facebook their latest custom HPA project... "After much delay the ‪Bingo Airsoft Designs MAC 10 PolarStar JACK gearbox replacement kit will be available by the end of this week. I had to completely redesign the FCU and battery storage so it will all fit properly. Installation video will be available by the end of the week also. Time to have some dual wielding HPA fun! The kit will work with both the AEP TM MAC10 and the AEP JG MAC10."