If anyone is interested, there is a complete chapter, with numerous illustrations, operating cautions, etc. on the Chaffee-Reece ("Reese" , though widely seen, is incorrect) in my "More .45-70s" book.

For example, do NOT put ANYTHING other than full-length .45-70-500 rounds into the magazine! The toothed feed system will - sooner or later - jam with anything else.

That's a pretty damn scarce item. Now that you have it, I'd keep it, and sell something you could be sure of replacing if a $$$$$$ squeeze occurred.

Side note, the bayonet, assuming it fits snugly and properly, might be rarer than the rifle!!