If your nozzle o-ring is dried out and seizing...then you need more oil.
Worth checking though....
- take the nozzle out of the bolt and see that the inside of the bolt is clean/smooth/etc...
---modding mags and then blowing gunk out of them through your gun is a good way to accumulate a thin layer of silicone/gasket stuff...that will add drag to your system aggravating things
---any dirt/dust/junk that is on your mags when you shove into your gun will end up in the bolt.
---good time to check that the nozzles o-ring is good...and that the piston head ports are free and clear.
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