yet again unregistered you dont have a clue and got spout crap, the SIG 510 series is based on the work of Feurrer (did i spell his name right?), his rifle was originally designed in the early 20's and produced in 1925. It was used as an autorifle, a sniper's rifle, a light mg, and was noted for its reliability in adverse conditions. the 510 is also equally reliable. Ask any one who fights with one in, oh, say Africa, Asia, or South and Central America. They have sold a lot of these over the years. As for the mauser, i'll give you a buck fifty for it.