I have a Mauser that looks to be customized cause I cant find anything quite like it on the web it has engraving hear & there. its got 3 lug lock up,straight bolt handle, DOES NOT HAVE 3 POSITION SAFETY and fully adjustable peep sight,ramped front sight. and single trigger. the only markings I can find is.... Mauser 30 cal. us government 1906 Germany... ANY IDEAS? sorry I don't have a way to post a pic. or " know how " Also... I think it is the large receiver ring cause it measures 1-3/8 across, 22" barrel w/ small sling swivel attached under it just in front of the forend.