Don't have time to post images but I believe it is an Underwood with an Underwood 42 barrel.

Noticed a number of PI stampings on the metal and the sight. I believe there was a M16icon on the trigger group. There was an SA stamped on the stock by the barrel.

The carbine was owned by a local rural police dept but not marked as such. Does any of this help? Tang had a W on it.

Thanks!!!
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