I have one of the new Birmingham built BSA XL Tac in .25, it's shooting at about 11 fpe with 19 grain H&N pellets. I enjoy shooting non magnum springers. I have an AWT sealed gas ram unit for a BSA Lighting in .22 and was thinking about having it installed, it's one of the 12 fpe limited units, just wondering how dropping in the a .22 cal gas ram unit will effect the power being that it's a .25 cal air rifle. I think there were a few guys that dropped .177 cal gas ram units in .22 cal air rifles or vice versa and I believe the power went up. I'm perfectly fine with it shooting at 11-12 fpe but was wondering...