Also check your nozzle to make sure it's not cracked. It is very common for them to rupture after upgrading to a metal slide and enhanced recoil spring.
It's also possible that your piston head's o-ring has ruptured or slipped off.
What brand slide are you using?
What barrel are you using?
Almost all aftermarket metal slide manufacturers do NOT intend their slides to be used with the original plastic outer barrel. Doing so will quickly destroy the plastic chamber, and may even cause cycling issues.
Also, how smooth is your slide movement? Restricted slide movement is the second main cause of excess gas consumption (next to poor sealing.)
Quote:
Originally Posted by pounce_the_jaguar
Are there any warning signs of a warn piston I should be looking for or do I have to take apart the blow back unit once again?
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You can see the nozzle damage only by disassembling the upper assembly.