friend of mine just acquired contender with 7 barrels. in with the extra barrels is a tc 2.5 electra dot scope. there was no base with the scope nor is there one on any of the barrels. anyone know what kind of base it takes, and how it mounts to the scope. it appears to take a rail of some sort. the scope has an upper mount built into the body. thanx for any and all help...captn-tin