There are differences...some of the subtle.

My '74 Fabrique Nationale B25 A2 has a case colored action, chromed barrels, and long slim foreend I haven't seen on Browning models.

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My '21 FN Skeet Speciale A1 is a model not offered here...

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I think they tend to be a better value for the money as it seems like you can get them for less than the same, or similar, gun marked Browning...kinda like you can get a Miroku for less than a Citori.