Smaller M4 modification from the Dboy manufacturer. I cut the barrel to approx. 120 mm, move the wiring to the front and put the Mosfet on the outer barrel.
I used the battery Lipo, but I do not know what the manufacturer is. Its parameters: Lipo 7.4 V / 2200 mAh and dimensions length - 110 mm (without cables), width - 35 mm
and a height of 17 mm.