Rear ring site for Mauser

[CraigMo]

Anyone recommend a quality ring (aperture) sight for a mauser? I haven't changed out iron sights much other than taking the rear off my M1A for cleaning and to white-line the yardage marks.

This Mauser.

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=276484834

Thanks.

Craig