This link from Remington shows the half magazine and a heavier appearing rear sight. http://www.remington.com/products/archived/centerfire/pump-action/model-25.aspx

There are three carbines on Gunbroker, all have the half magazine, one appears to have a sight like the one in the Remington brochure, one has a Lyman receiver peep sight and does not appear to have a dovetail for a rear sight. http://www.remington.com/products/archived/centerfire/pump-action/model-25.aspx

No meaningful information I am afraid, but it is a delightful looking gun.


Jim H.