You're such a noobcakes. The yakB is not an aa gun, it's a a .50 caliber anti personal gun mounted on the hind. It even says 12.7mm by 108mm in the classname, if you weren't so dum you'd have know that 12.7mm is half an inch thick, and 1 caliber is 1 inch, so 12.7mm = .5 in, so it'd be a .50 round, something not suitable for aircraft.
Dum people these days, missing out on obvious stuff.