Low fps could it be cylinder related?

Pollynator_bravo2 said:
What’s the correct O ring size for the piston and cylinder head ?
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Cylinder head is generally 22mm OD, 1.5mm cross section.
Piston head is generally 24mm OD, 2.4mm cross section

AK2M4 sells some slightly larger piston head O rings for slightly larger cylinders; they are 24mm OD, 2.7mm cross section.

 
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Compression test the cylinder. With the cylinder out of GB with tappet and nozzle fitted. Hold finger over nozzle and push piston down into cylinder. It should stop 2/3 way down when all air is compressed. If it doesn't replace the piston oring. 

 
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