Before tuning we recommend that you fit our Rear Dovetail block for maximum efficiency or the Longer Bolt probe.
Crosman Rabbit Stopper/Ratcatcher  tuning kit.
Includes:

Set of 3 different strength springs
Spring Guide
O-Ring set
MS1 Lube
Large Bore Transfer Port
Seal Lubricant

You can add the longer Bolt Probe under the options tab below. (£17.99)
Mods for increasing the volume and Co2 flow
Do not fit to the pistol if you live in the UK, as this could put it over our 6 ft limit. Especially if you have our rear dove fitted.
Always check the power to make sure the gun does not exceed your limit, after changing any parts.
If you are in the UK then make sure you do not exceed the power of 6ft lbs for pistols and 12ft lbs for Air Rifles.