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Christopher, It should. Westernfield were Mossberg 500s. See following thread from Westernfield thread.---All Mossberg 500 parts will fit your gun as long as it's the same gauge and the action bars are the same. Some older guns were single bar forearms where all later guns are double.

western field models were made by different makers I would see if anyone you know has a Mossberg 500 and try his barrel on your gun to verify that a Mossberg 500 barrel will fit before ordering

Christopher, it will fit fine. Gunparts Corp.'s (Numrich Arms) catalog #26 cross-reference does show the Western Field 550A to be the Mossberg 500A. (The "A" in Mossberg nomenclature simply denotes 12 gauge). ----- https://www.gunpartscorp.com/brand-cross-reference?page=17

Christopher - Western Field 550's were indeed made by Mossberg. All Mossberg 500 parts will fit your gun as long as it's the same gauge and the action bars are the same. Some older guns were single bar forearms where all later guns are double.