I think all parts are explained and illustrated in The Parker Story. The Parker try gun is so overengineered that it is a bit of an exaggeration. The Arthur P. Curtis try gun performs the same job with about one tenth of the parts and machining cuts. Curtis try guns are so rare because they can be returned to a common Parker (or other gun) with just a replacement stock. Apparently most of them were, and the try parts discarded. My Parker Curtis try gun survived in original condition because it was in the hands of stockmakers for it entire life and used for its original purpose. There is a Lefever Curtis try gun still surviving, but that is the only one I am aware of other than my Parker Curtis gun. Chris L. has posted pictures of the Curtis gun here before, and maybe he will again.
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Threaded Mode