So I just received a MD as a gift. Took it outside to try it out. Our home was built in 1870 so I suspected I'd find some neat stuff. I decided to dig the first hit I got. Found these two pieces about 8 inches down. I know nothing about guns! But it's pretty heavy maybe 2-3 lbs and the barrel is close to 4 inches. Bore looks to be 3/8". What kind of gun and how old? Any good reason it was buried? Thanks.