If you closely at the hammer of a model 53 Jet, you'll see at the top of it it has a "switch" that you pull back on to engage the rimfire portion of it. There is no firing pin on the hammer, they are "floating" mounted in the frame, two of them. Quite a slick set up. And don't bother with the 22lr inserts that come with 53s, they are a pain to use. If you want to shoot LRs, make sure you get one with the extra cyl.

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ken
SWCA #1959