Thank you for the reply! The barrel has no markings at all that I can see, my upper has a keyhole stamp and my front sight has <B>1 stamped on it. I have been searching the internet and can not find one that even looks the same. I would like to start reloading for it. I guess not knowing anything about it isn't that big a deal, just has become kind of a mission to find out at this point. Any ideas on where I might look? Thanks again for any input!