Most KJW guns WILL take red gas even the plastic ones, and when you break that Plastic slide, just buy a metal one for 30$ and your GTG, forever!. TM M9's are also legit. But I think the most solid GBB I ever used was the KJW G23..I have thrown, dropped, stepped on , shit you name it mine went through it and kept on kickin, and the kickback was probably one of the strongers for a GBB...