CFX, on JM's site, he has the Apex Large Seal, and in the description it mentions the 460. Now as for the spring...I'm afraid JM would have to answer that, or you could get one from Umarex. I dont have a 460 or any data that anybody has shared about what the OEM springs specs are. If I knew what the OEM spring specs were, I might be able to help. The specs I need would be total coil count, wire OD, springOD. But JM is the best source to ask because he is THE spring guy.