There are a couple available for the Ruger Mark II The Volquartsen Extended Magazine Release: http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=590435 Ranch Products: http://www.rimfiresports.com/merchant.mv?Screen=PROD&Store_Code=RSC&Product_Code=RP2MR
Magazine
Contact ruger and request a owner's manual
No such weapon. It is either a Mark II pistol or a Redhawk Revolver.
50-225
50-200 USD
You can request a owner's manual at the Ruger website.
Which one?...The Mark 1's and Mark 2's are pretty valuable...
50-175 USD
75-260 or so
The numbers 10-21133 are the serial number that was assigned to your Ruger Standard Mark I pistol,which was made in the year 1969.
Ruger will tell you if you phone customer service.
100-500 or more depending on specifics