Hey Fellas, first post. I am looking for information on this rifle. My business partner's father inherited it from his dad. I was told it looks like a J Stevens Tip-up, but I have not seen one with two triggers. The front trigger unlocks the breech, second one drops the hammer. There is a thick patina of rust obscuring any markings on the reciever or barrel, so I am unable to determine the caliber. I snapped a pic of the bore with a 9mm round shown for size comparison. I was told these were made in .22 and .25 rimfire, but the bore looks a little large for a .25. I dunno gents, any ideas or advice on where to research would be greatly appreciated. Thanks in advance!