Airsporter/Mercury power problem
Has any one had problems with Airsporter/Mercury low power using none genuine alloy piston heads. I have had an Airsporter apart 4 time replaced the nylon type head that was sized with a alloy head , new Oring buffer washer and spring . .22cal and its only doing 8 ft lbs , fitted a Titan XS spring and use a genuine BSA O ring still the same. Also i have rebuilt a .22cal Mercury new alloy head , seals spring and barrel seal 9.5 ft lbs ?.
.22 Venom Mach 1 (FAC) 6-25x56 Millett.
.22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
.22 Venom Mach 2 Sporter 4-12x40 Leupold.
.177 Venom Vantage 4-16x50.
.177 Venom Daystate 8-32x56 AGS.
.22 Venom Datstate 4-16x56 AGS.
.22 Webley Venom FX2000 6-18x40 Busnel Legend.
.177 Titan MPT by Steve Pope 6-24x40 Tasco.
.177 Pro-Sport 4-16x50.
.22 Webley FX2000 3-9x33 Leupold EFR.
.177 Logan Solo 4-16x50.
.22 HW90 (spring powered) 4-16x50
.22 Gamo Stutzen.
.177 Walther lever action.