There is a hold open device, actuated by the side button on the magazine. It's a little spring along the inside of the right slide frame. This came around somewhere about 1908, I think? These were not mandated for military until 1913. It appears that you do not have the stock lug either. Another thing that happened in 1913. You do have the dished toggles, later models had flat toggles.
As for snap caps, I used the brass of an expended round. Don't have any extra laying around right now.
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