Kwa kz75 hammer problem
 

Hey so i recently purchased a kwa kz75 and im having some issues with the hammer. When i rack the slide and release it, the hammer returns to the forward position. It shouldnt return to the forward position when the slide returns forward. Any ideas?

The triggerbox contains a few springs, and many pins. These act to lock the hammer and trigger in place when the slide moves back, readying the striker block to hit the mag when the trigger is pulled. One of the pins locking the hammer back may be broken or misaligned. This repair would require disassembly and possibly replacement of certain parts.
I suggest seeking help from a local gundoc that can be found in the stickythread "Calling all gundocs"