Here's what I have on that one from my reference:
KMK-6NRA (Ruger model 0148) "Friends of NRA". Known s/n range 223-75767 to 224-37522. 750 made for Friends of NRA auction events around the United States in 2001. Features a black enamel type of ornamentation on right side of barrel that includes a rectangular panel with "Limited Edition _____ of 750" in script with vine scroll to the left and right sides of the panel. "National Rifle Association" appears on the other side of the barrel, also in two lines. Appearing on the back of the bolt in black enamel is the NRA abbreviation logo flanked by vine scroll extending to the sides of the bolt ears.
If the gun you are looking at does not fall within the listed sn range, please send me a PM so I can update these records.
Thanks!!
Chet15