Not AFAIK
Your rifle was made for Sears by Marlin.The Marlin model 81 and your rifle are one and the same.
Both the Sears 103.2 and the 103.228 models are a Marlin Model 80 rifle.
Depends on if that model is offered in 243
This rifle was manufactured by Mossberg. It is the same rifle as the Mossberg model 50. Although there may be a slight difference in the sights available on the two models, mechanically they are the same gun.
The model 100 is a .177 caliber air rifle. The model 101 is a .22 Caliber rifle. Basically the same air rifle just different calibers.
The mossberg model 45A is the same gun as the western field model 47.
Marlin is about same as model 81
The marlin model 39A is the rifle model,while the Marlin model 39M is the carbine model.
Made by Marlin....same as the Marlin Model 80
The Sears model 2200 is the same as a Savage Model 80 Series A.
This rifle is the same as a Marlin model 80
Made by Marlin....same as the Marlin Model 80