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J Steven's 12 gauge

My dad has a J Steven's 12 gauge pump model 520-30 serial num 50434 I think it's a ww2 trench gun missing heat shield and bayonet would like to know the value of this gun
Comments
Collector value is less for in-complete units (no hand guard) and more with the bayonet. I think I have seen a list of serial numbers but that was a long time ago. Fakes exist for collectibles.
The 520-30 was the most common of the Trench Guns, according to the BB. Because of this, even with the correct replacement parts. It would have to be Original/excellent, to be worth big bucks.