I just recently traded a mosberg 12ga. pump for a sbh .30 carbine 7.5''. I like revolvers it looks nice next to my sbh .44mag. 7.5''. Anyhow what is the history (if any ) on this particular gun,i know it shoots the same bullets my m1 shoots but has ruger had this model for awhile. The gun shoots great but its blueing is worn. Lookin for a little more background on this one.