Well I ordered this butt plate for the rifle
http://www.gungrip.com/detail_B342__...buttplate.html, But turned out it doesn't fit. The butt plate that came on the rifle doesn't have marlin written on it and should be smaller than the one that this website says is for the model 81.
Here is a picture of the butt plate that came on the rifle.
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This looks like it should be the model 44 butt plate. Before I order another I would greatly appreciate impute from anyone who owns one of these rifles.