Short answer: you have to remove the barrel.
The FX is a bit more complicated than the Webley Raider 2-shots....but both are easily removed by 2 allen screws.
Best is to place a piece of tape on the receiver and the barrel and make an alignment mark on them.
For the Raider, there are 2 small allen screws on either side of the breech block where the barrel is set in. Unscrew them both and you can slide off the barrel from the front.
One unique thing that Mac 1 suggested to "tune" the power of the Raider is to twist the barrel to close off the transfer port....it's the same idea the FX rifle use except a designated screw hole is done on the right side of FX rifle.
For the FX, only one allen screw is on the top of the receiver and one is located under the fill probe what secures the muzzle weight.
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