Disco valve, striker, striker spring, transfer port etc.? Then performance should be about the same as a Discovery, and the two should bolt together just fine.
(Am going to assume a steel breeched 2240 carbine).
If using some 2240 parts, be aware:
1. Some steel Crosman breeches use the old breech screw location, and those that do also use the old striker. New striker has a circular cut out to allow for the new breech screw's location.
2. There seems to be a difference in striker springs between the discovery and the 22XX guns.
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