ASG CZ P09 venting

[AGR]

Hi all

I have just bought a new ASG Cz p09 poly slide pistol. I brought 2 new extra mags with it. All 3 mags vent after firing 4 or 5 rounds in rapid succession. Sometimes it won’t even push out a bb and it rolls out seconds later. I’ve tried abbey 144a gas and WE green gas, both give the same results. 
 

I presume it’s the pistol as opposed to the mags. 
 

Can anyone advise me on this please? I have 4 other pistols from different manufacturers and none have this issue. 
 

Many thanks

 

[novioman]

Sounds like a nozzle problem if it’s happening with all 3 mags. Make sure the nozzle is not fouling against the hop unit. 

 

[AGR]

Hi, I stripped it down and the nozzle and bucking seem ok. However, after putting some rounds through it I noticed they were oily?!  Could some lubricant in the barrel be the cause of this?

 

[AGR]

Just tested the pistol with nuprol red gas. Fired the whole mag of bbs no problem at all???!! With a poly slide??! 

Confused 

 

[theSwede]

Like someone stated above it sounds like a nozzle issue. It should be moving freely with just enough resistence to keep a tight seal. Some silicone oil on the piston might help.

The higher preassure gas might have helped push the nozzle harder.