Were those receivers threaded...........??
I looked at the rifle carefully today, and while the barrel says, "513T Matchmaster", I believe it was a made-up gun.
The receiver has the same bolt-sleeve, tapered, w/the ridges on it, and there's a sporter-type stock, inletted for the tubular mag, and the hanger for the tube is in the right place. But, there are some very tiny scratches (2-3) near the hanger itself, that leads me to believe someone put it together using a 513T barrel they came across. There is no wording on the receiver.
I've been thinking of putting swivels on it to make it easier to carry in the woods, and a decent 'scope (got a no-name 4X on it now), and probably a cryo job, to see what it can really do (or not).
I got a target w/it, good for a sporter, but not the fantastic; But I see the 'scope isn't mounted perfectly true either, so who knows what it is really capable of? I'll square-up the mounting of the 'scope before I do anything else to see how it shoots as is, and, the price was right, so, I have the opportunity to experiment.
Thanks for the replies, I appreciate the help.