High Standard Shotgun?

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I have a High Standard Shotgun I thought was a Riot Shotgun Model. Well my buddy ordered a new trigger and guess what? It ain't the right trigger. How do I accurately identify and get parts for this shotgun. Any ands all help would be greatly appreciated! Thank You!

 

[Harley Nolden]

PATH:
If you can provide the model number possibly we can determine which High Standard you have. Then we migh possibly help.

HJN

 

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HJN, ECHO23TC gave me a lead to a picture on auction arms.
It is posted in the Shotgun Forum. It appears that I do have the Police Riot Shotgun. My only problem is that my smith told me he was having trouble getting a replacement for a broken trigger. The problem may be the supplier sending the wrong trigger. I'll let you know how it turns out. Thank You.