The little one is a 1929 Remington Model 24. The larger one is a 1951 Remington Model 241. They both use the same tang peep sight, which is hard to find and expensive. I found one for the Model 24 a couple of years ago, and last week I found one for the 241. Installed the sight and took the 241 out back to give it a try. Shot once at a resetting steel squirrel target, hit dead center. The noise rousted up a squirrel and he crawled along a limb back behind and above the target. Shifted me sights, shot once... squirrel fell off the limb DRT!