A friend of mine just inherited a very old hammerless pump gun. It looks like a browning with the squared off receiver but it has 2 triggers facing each other. Pull the rear trigger and it shoots, push the front trigger and it re-cocks, assuming its there in case of a misfire. Aside from a serial number there are no marks on the gun, doesn't even say what guage it is. Think its either 16 or 20. Also has a solid rib barrel, when you pump it the side of the receiver slides back, and a large block slides out of the loading gate underneath and has what looks like a knife blade on the side. Any help in identifying it would be greatly appreciated.