The 2100 has the same diameter tube, and in fact the same pump cup. It is a longer stroke. Several people have combined a 2100/2200 pump tube and other parts with a 1377 to make very potent carbine.
I think some sort of a Benjamin 392/Discovery crossbreed would be cool. Crosman has most of the parts to do it all ready. A new steel tube and a new stock would be the main new parts they need to come up with.
Perhaps a .20 caliber Sheridan version too!
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