I have a ~25 year old Ruger Single Six .22LR that I inherited from my Father. I get it out a couple times a year just to shoot 50 rounds or so, then clean it good and put it away for another 6 months. I'm thinking of shooting it this weekend, so I got it out to wipe off any excess oil, bore and outside. Looking at the transfer bar, if my terminology is correct (the thing the hammer hits then it hits the firing pin) and I noticed about 2/3 of the way down, what looks like a crack. Either a crack or the plating has chipped away a little bit. The handgun works fine. Could this be a crack? Is cracking a problem with these? I doubt the gun has much more than 500 rounds shot through it. Thanks in advance for the advice.