OK, I've been doing some online stuff trying to find out more on this Topper 158 H&R with no Serial numbers in a 20 gauge my grandfather found. On the top of the barrel it says 20 Gaugue ~ P, then underneath that it says FULL CHOKE, otherwise, on the side it says Topper Model 158, then Harrington & Richardson, INC, then AA-US.PAT.287XXXX? That's all I got, no other numbers anywhere.
Also, can these be disassembled? If so how?
Thanks guys!