Lately, I have been itching to get a US Military Stevens 520 Shotgun / Trench gun and I've been keeping an eye on Gunbroker.

How many variations are there in the Stevens 520 shotguns?
I notice some have the heat shield and bayonet mount and some don't

Like this one, it doesn't US Military Stevens 520-30 Combat Shotgun WWII

and This one does WWII US MILITARY STEVENS 520 TRENCH GUN SHOTGUN
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