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Benjamin the receiver mount is a Picatinny Rail Mount.

Picatinny. You can tell be the indentions/spaces on the rail.

it is a Picatinny Rail see *** "The Model 783 Heavy Barrel features a *******picatinny rail, SuperCell® Recoil Pad, and a flat dark earth synthetic stock that contains a high nylon fiber content, which promotes superior strength and rigidity. Also helping deliver those inherently tight groups is a precision button-rifled barrel. For shot control, it's equipped with the crisp new CrossFire™ trigger system that's user adjustable to suit your preferences." https://www.remington.com/rifles/bolt-action/model-783/model-783-synthetic-heavy-barrel