Yes,the (b( model was the same as the (a),the difference being the (b) had a different sight.From the page I looked at:
"Model 46M(b) S130 sight replaces S100, made 1947-1952."
The attached picture is a Mod 46M,the (b) would just have different sights.
I hope this helps.
I have recently aquired this model of gun. could you tell me what the value of a mossberg 22 s-l-lr 46m
maybe 200 bucks in good shape
Joe: You replied to a thread that is 3 years old and received no replies.