[Conker]

Someone stepped on my TM M4 and that broke the receiver. I'd rather get just an upper receiver instead of a 240$ complete new receiver, as I already have a well working KA M4 (and not that much spare money, screw you gear addiction).

Considering that KA uppers alone are hard to find, I was wondering if there was any other make (that's easier to find, such as G&G) which would fit a KA lower with little to no mods?

Thanks!
Conker