Gamo IGT replacement with NP2?

[Airgunsquirrelhunter]

I have a spare NP2 gas ram and was wondering if I can replace the Gamo IGT ram with it. All the dimensions are the same except the NP2 is 1/4in longer than the IGT. I thingk the IGT is weak as it is only producing 627fps a foot away from the muzzle with a 14.3gr pellet. I already replaced the piston seal with a Vortek seal and went from 575fps to the 627fps. The breach seal is sealing I did the toilet paper test and it did not move. Will I destroy the rifle with the slightly longer NP2?

 

[Odoyle]

Have you tried restricting the transfer port by using a tight fit brass sleeve to wedge press fit inside? That alone may add some velocity.

 

[Airgunsquirrelhunter]

I have not, but I will definitely look into that! Thank you very much for the idea.

 

[270windude]

I guess it depends on the length once compressed. One way to find out. Try it and see if it cocks. Otherwise how’s the accuracy?