I am trying to ID my Dads old air rifle, it is at least 30 years old, all metal construction except for Brown Plastic slabs on the stock and a wooden grip, a Barrel Break with "Cal 170" and "073009" on the bit below the rear sight. A feature I haven't seen on other rifles of this type is a spring loaded magazine for round pellets (the tube along the top of the rear of the rifle) that feed a pellet into the chamber when the barrel is cocked. Any help would be appreciated. If this is in the wrong section, could one of the mods please move it to the appropriate one