After comparing the pic with some examples, I too think it is a Aubrey/Meridian Arms sourced from Sears and the tubes of Krupp steel from Belgium. What would aide in the elimination is that if is was known that it was either a boxlock or sidelock. The Greenpeace save the whales, I mean birds, comments are unfounded, out of context and way off base. Either the raptor was cutting into the Sunday chicken dinner or he was the white meat dinner himself. Hunters didn't put the raptors on the protected list as it was DDT, and possible a few other compositions. The raptors thrive well as do other predators since there aren't many folks eating coon and opossums and if you don't have predator control on a preserve or hunting area, you aren't going to have a lot of game.
Kind Regards,
Raimey
rse
