Mossberg 144US Questions

[Sheppsan]

Hoping you guys can help shed some light on a 144US I picked up at a gunshow recently. Rifle is parkerized and has serial US35120; however, the zero looks like it was hand stamped later but before rifle was parked. BARREL has DOUBLE circled P stamp. Rifle has twin holes to mount rear sight and a Mossberg S331 is installed, though my understanding was that a Redfield with one mount screw was used. Any insight would be appreciated.

Thanks, Sheppsan

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