KJW KP-05 three problems
 

1. The hammer does not always come back fully (stops half-way)
2. The bb does not always feed so not fired
3. The slide does not open and lock after last bb in mag or when CO2 finished

I cleaned and greased the slide and oiled the spring follower but this did not make a difference.
Are these 3 issues related and /or is there a simple fix for all problems?
Thanks!

These issues have occurred all at the same time recently

Sounds like there is not enough gas going through the gun. Did you check your nozzle and see if there are any cracks? It could something to do with the hammer assembly as well.

I am getting around these issues by racking slide manually for each shot which is also giving me about 15-20 more accurate shots per cartridge .
I presume that manual racking saves on gas consumption.

Still wish I knew what the fix is for normal blowback function.