For those inquiring minds it is a modified Winchester 1892 .44-40 lever-action rifle called the "Mare's leg".
http://www.neatorama.com/2011/05/26/...r-sale/#!BIazz
Dean
Also
http://www.henryrifles.com/rifles/mares-leg.
http://www.rossiusa.com/product-list.cfm?category=17
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