he he ran into a problem with the rifle... I disassembled the crossman carbine and... I found that once I take off the rails, and the outer barrel... there's a piece about 2 inches long that prevents the nerf barrel from fitting flush against the receivers. Also, I got the one that has the perm carryhandle sight, so... depending on how the nerf piece fits to it, I may leave that on there, or I may go ahead and take it off (with the dremel) and replace it with some picatinny rails. Unfortunately... I don't have and cutting wheels for my dremel right now. Discovered that to my shock this morning so... I'll have to get some of those and until then I'm stuck on the rifle.