I have an older Topper 30-30 and a 22 Hornet Topper. The barrels off of these 2 won't fit any of my later frames, nor will the later barrels fit on these frames. Just checking fit, no I wouldn't try to shoot them. The barrels won't swap between the 2 frames, either. The underlug seems to be a bit longer on the older barrels. They both are the screw attached type, they aren't the snap on type. Your results may be a lot different, this is just what I found on these 2 guns.