For a stock, you may want to check Richards microfit stock for one.....look in the bargain bin section. This is where I found a nice sporter stock for mine some time ago. Oh, they can make one for you inletted decently for the 91 mauser action, but a word of caution, long wait for it and sometimes Richard's microfit is fussed about by posters not happy with the company. If you want a military stock, then check Springfield sporters for one for thay sometimes have one. By the way, if receiver says 1891 Argentine on it, then that is what it is......one of Mausers early designs and certainly well made. Mauser introduced the external claw extractor and double stack magazine in the 93 mauser, which your 91 does not have.