I just bought a Ruger Single Six off Gunbroker and have a question about it. It looks just like a Vaquero...blued steel grip frame and ejector rod housing, case colored frame, simulated ivory grips. I've seen these on GB before in the three standard barrel lengths...this one is 5 1/2" and in .22LR only...no mag cylinder. Was this a limited edition? Who distributed? Thanks.