The wide brass friction ring stays between the spring and the forged barrel ring which is around the magazine tube. the narrower beveled ring fits between the brass friction ring and the spring; This is for heavy loads. For lighter loads, place the bevelled ring between the receiver and the spring so the the spring is between the two pieces. Just remember "top heavy" both rings toward the top for heavy loads. auto5man
While you do not state weather you have a 1851 navy standard model or London model,these early made percussion colts were made from 1850-1873.The third model and the fourth model of the standard model 1851 navy both had brass trigger guards.these were from serial number 4,200-215,348,which was the end of production.The london model all had the brass trigger guard and brass gripstraps.these were made from serial number 1-42,000 from the year 1853-1857.