My grandfather gave me 3 of his shotguns this weekend. They are all break open guns. One of them looks like it would be a black power shotgun. There is not much of anything stamped on the barrel. One has a company i've never heard of, one is from sears roebuck, and they all have the gauge on them. If I take off the wooden stock under the gun and remove the barrel I see random numbers in different spots. I see no serial numbers. Is there a gun book I could buy or rent from the library that I can use to identify exactly what I have? Also I doubt I could shoot any of these without replacing the o-rings. They were used frequently for hunting plus they look pretty old.
I took a picture with my cell phone of all 3 guns together but I don't know if that will help. I can link that if it helps.