I believe the fundamental difference in the rimfire versions is that in the NY version the barrel is offset in the action. This allows them to use a round firing with a faster lock time.
The offset barrel also allowed them to successfully use a Mauser style extractor. One of the selling points for me.
Pretty cool info in this thread. However, having a mauser extractor sounds great, until I think about how well even my cheap azzed Savage 22lr's extract. Then I think, have I ever had an issue with extraction on a good bolt action. The answer is yes, but that was a worn out Mossberg Chuckster 640KD my dad gave me. After replacing the extractors and springs, it works flawlessly. The Winchester 320 that I have and my 1949 Winchester model 52 are probably the oldest rifles in my collection, yet they don't and have never had any extraction issues. I'll admit, I love the mauser style claw extractor on my centerfires, but question how much better they are on an 22lr or rimfire rifle...
