I'm assuming you have a full-length rifle, rather than a carbine. I have the stock and handguard (originally held on with twisted wire) for a carbine or short rifle. It did NOT have the stacking "hook", but DID have the front sight with "ears" on the nosecap. It's in decent shape and I believe I sttill have the sling swivels and buttplate but not the nosecap. Some previous ownder stipped the finish, and it is a orange-ish color, almost looks like maple. The action and barrel now sports a full-length walnut Mannlicher stock, in the European style, with all the carving and stuff - sort of a 20-century Jaeger. I've always liked the Mannlicher stock to those rifles with an exposed box magazine, ever since I saw Peter Lawford storm ashore in The Longert Day with his Mannlicher sporter - just too cool.
If you or anyone else is looking for a stock like what I have, send me a PM.
Oh yeah - Mausers were sold all over the world, to so many countries, you could portray just about any nationality. Even if it still has the Argentine crest on the receiver, most countries sold off their older arms when they re-armed with another weapon later. Match up with a Webley, or some French or Belgian revolver, and you could portray a Boer, or an American or Spanish revolver and go with the South American, or Mexican revolutionary. The 7.65x53mm Mauser originally was loaded with a .313" dia. bullet, but most reloaders today can't find this, and use the .311-.312" used for .303 Brit or 7.7mm Jap. Even .308 can be used, but I wouldn't use it for targetshooting or hunting. Never shot naked lead bullets in mine. '91 Mausers are notorious for having soft receivers, allowing the locking recesses to be set back, so BE SURE TO HAVE THE HEADSPACE CHECKED!! Mines's a little long, so I only shoot new cases that I first fire-form, and then neck-size only. Factory ammo shows indications of case stretching and primer set-back, luckily I had no case separations.