Blow-back issue..

[LeonTheAmateur]

Hey all, I have a KWC/Cybergun Taurus PT99, and the issue I am having is that at random the blow-back will not function causing the hammer to not get cocked. This happens without warning, I can shoot a random number of BB's semi-auto as well as full auto without issue before this to occur at random. At which point I will have to re-cock it manually.I have had it apart and cleaned and lubed up, no luck. I am hoping someone with experience or knowledge can steer me in the right direction.Thanks

 

[Sneaky]

Where did you buy this from as it would be best to send it back to them to replace for you.

 

[LeonTheAmateur]

I bought it 10+ year ago.. unfortunately. I mayb in the meantime have found the culprit, sometimes the slide wouldn't go back completely. I have stretched the guide rod' spring. Have yet to test if this has solved it.