I have a new 336 I got from Cabellas on the used gun rack. It still had the "Made in USA" tag hanging from the front sling mount. Cabellas said it was part of a deal where Marlin got rid of all their new stuff after the takeover, with the requirement that it be sold as "used." The first time I loaded it, the brass left a clear scrape on the loading gate that is still there. So I'm sure it was brand new. I fired it fifteen or twenty times at the range and things were fine. But now the lever locks up on me constantly. With the lever down, it is impossible to move and the loading gate locks up too. In some cases a round is removed from the magazine, and it can be shaken out of the ejection port, but I have to take the thing apart to get the lever to go back up. Once I've done that I can work the lever (empty) a dozen times and it works perfectly, but load it again and suddenly it locks up. I can put a round in the chamber and fire it just fine. But I can't load from the magazine and fire. Anybody got any ideas about what's wrong?