Nope - the design was the same from the get-go. After the first couple years production, they added a magazine release button that would allow you to unload the tube mag through the loading port, rather than cycle them all through the action manually. That was the only change.[/quote]
Hmm , that's interesting. When I first purchased my carbine, it was very unreliable. Essentially a single shot
.... After ruling out all of the common causes. I realized that the front lip of the trigger assembly had broken off. It's cast aluminum and the front "lip" protrudes about 3/4" , forward towards the muzzle end.
I was told that it's difficult to weld cast aluminum. Ruger was no help at all....( about half rude). I eventually found a replacement at Numrich. New piece. Exact same design except that the protruding lip was now gone and the front edge of the trigger assembly was held in place by slipping underneath a shelf in the receiver ( after being modified slightly by my gunsmith)
I apologize for my vague description, but it's the best I can do with words. Easy to see visually. Anyway, the gun has worked just fine since then.....Both my gunsmith and I just assumed that the newer versions must have had a slightly different trigger assembly. If your statement is accurate, then I can't explain why I received this modified assembly...
I'm open to other explanations !! mike ( Not a Ruger expert or historian by any means)