Adjusting the Power on my Stoeger XM1 S4

My Stoeger XM1 was wildly inaccurate, mainly due to very inconsistent power. In this video I change the transfer port to get it under control.
These transfer ports fit the Stoeger XM1: www.trrobb.com/details/p14494...
CJ Outdoors has done a three part video, changing the transfer port: / @cjoutdoors8264
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[@Maddogairguns]

It didn't exactly tame the power, but it is more consistent. Further testing required to see about accuracy.

[@rdrhouse]

I had the same problem with this model, so i drilled the original transfer port out to 2mm and i'm getting a maximum of 11.3f/lbs from a poor 9ft/lbs

[@taunteratwill1787]

The man cave with the UK castrated air guns "all the way up" to 12 foot pounds! 😂

[@user-bd4xd2oj9x]

What is the solution to air leaking from the gun?

[@brashutecaruso9668]

Mad Dog, can I ask where you purchased that bipod for the XM1?

[@gman9543]

Looks like you need to back off the hammer spring. Seems like it's using more air than it needs to be using, and the reduction in transfer port just created a resistance to transfer which stretched the amount of air being used. Increase in velocities might be from the finish/polish or mating of the replacement transfer port. If you back off the hammer spring now, you should be able to maintain the same speed and increase your shot count.