GBB Glock - Slide locking back 1 BB too early.

[Alcon H]

Hi all,

 

I have a fairly new KWA ASG G17 that's developed a slight annoyance.

 

When running a whole mag through, the slide locks back despite still having a bb left in the mag. There is plenty of gas left in the magazine, and I can't for the life of me figure out what is causing this.

 

Any ideas?

Thanks.

[Prathios]

Is the spring in the mag not pushing the last one up enough? I know its not uber help but it might just be that simple

[straffham]

Sounds unusual, on the plus side it's better than not locking back after the last shot is fired which I've known to happen. Are the mags the same make as the gun? If not it could be tollerances are out?