WW BSA Airsporter / Mercury Parachute Piston seal adapter kit.
Convert your old BSA Airsporter / Mercury’s O ring piston seal to an updated parachute seal, the seal gives superior sealing in the cylinder giving better shot to shot consistency and a power increase. The new adapter is easily fitted onto the pistons stub.
Designed & machined by myself Welsh Willy here in the UK, I have been using one in my BSA Mercury and the results have been outstanding, I had to reduce the spring length by a coil & a half to keep power below 12ft lbs.
The rifle is now easier to re-assemble with very easy cocking and smooth shooting cycle.
Kit comes with
Delrin piston head /seal adapter pre-fitted parachute seal & roll pin, Viton rubber buffer washer
This adapter kit does not fit the BSA MKI / MKII models of the Airsporter with a leather piston seal
See pics of CHRONY readings before & after, spring had to be trimmed, fps spread in low single figures, CHRONY FI Readings using RWS Superdome 14.5 gr pellets.
Kit can be supplied with a WW spring service kit or on its own.
Convert your old BSA Airsporter / Mercury’s O ring piston seal to an updated parachute seal, the seal gives superior sealing in the cylinder giving better shot to shot consistency and a power increase. The new adapter is easily fitted onto the pistons stub.
Designed & machined by myself Welsh Willy here in the UK, I have been using one in my BSA Mercury and the results have been outstanding, I had to reduce the spring length by a coil & a half to keep power below 12ft lbs.
The rifle is now easier to re-assemble with very easy cocking and smooth shooting cycle.
Kit comes with
Delrin piston head /seal adapter pre-fitted parachute seal & roll pin, Viton rubber buffer washer
This adapter kit does not fit the BSA MKI / MKII models of the Airsporter with a leather piston seal
See pics of CHRONY readings before & after, spring had to be trimmed, fps spread in low single figures, CHRONY FI Readings using RWS Superdome 14.5 gr pellets.
Kit can be supplied with a WW spring service kit or on its own.
Convert your old BSA Airsporter / Mercury’s O ring piston seal to an updated parachute seal, the seal gives superior sealing in the cylinder giving better shot to shot consistency and a power increase. The new adapter is easily fitted onto the pistons stub.
Designed & machined by myself Welsh Willy here in the UK, I have been using one in my BSA Mercury and the results have been outstanding, I had to reduce the spring length by a coil & a half to keep power below 12ft lbs.
The rifle is now easier to re-assemble with very easy cocking and smooth shooting cycle.
Kit comes with
Delrin piston head /seal adapter pre-fitted parachute seal & roll pin, Viton rubber buffer washer
This adapter kit does not fit the BSA MKI / MKII models of the Airsporter with a leather piston seal
See pics of CHRONY readings before & after, spring had to be trimmed, fps spread in low single figures, CHRONY FI Readings using RWS Superdome 14.5 gr pellets.
Kit can be supplied with a WW spring service kit or on its own.