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Old 13th November 2014, 06:26 AM
Dale Dale is offline
Senior Member
Join Date: Sep 2009
Location: Cornwall
Posts: 220

Originally Posted by Skypilot View Post
That makes a big difference & makes a conversion of a US FAC model to 12 FPE somewhat more problematic.
Actually it doesn't.

3.2mm with the factory stroke length and piston weight is pretty optimum for 12Ft.lbs, the 2.6mm is a bit on the small side for 12ft.lbs leading to a bouncier firing cycle.

On my UK version I have opened the port to 3.2mm and it shoots really nice.

On a 23J version just change to a 16J spring.

Have a read of this for some more info:

Also have a read of this thread on Airgun BBS:

Last edited by Dale; 13th November 2014 at 06:32 AM.
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