Hi all happy new years .I have crosman 2240 it will not cock right I pull the cocking lever back put in pellet and pushward but it will go all the way forward and go in to locking Slut .so I can not load a pellet .any help I replace barrel it 14 177 caliber it is all stock in side trigger Assemblyis all stock also .any help would be great oldgeorge God bless thanks