raptor cocking lever and realsteel fire selector on we m4
 

sirs may i ask your expert advise regarding this.does the raptor cocking lever fit the we m4 gbbr upper receiver?im using a closed bolt gbbr.and does anybody know of a mod to make the realsteel fire selector fit and perform perfectly in the we gbbr lower receiver?thanks again.

Your questions have been answered before in the WETTI / WE M4 Thread, that'd be a good place to check.