Originally Posted by Pistol PMD
I have a Top Tech M4 blowback. The metal conversion question doesn't seem to have a solid answer. Ive heard it definitely can be done, and Ive heard it definitely cant be done, and everything in between.
It can be done. Its an unfortunate amount of work. I ended up ditching the pneumatic mechbox for a standard, and just built an M4 from parts. Stock, the pneumatic mechbox will not fit into a metal receiver (Unless its a metal receiver made for it).