Charles, this model has a 24" Carbon Steel Heavy Threaded 5/8″-24 TPI Barrel that's Button Rifled with a 1:8" Twist .

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Yes it has a threaded heavy barrel "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."
remington.com/rifles/bolt-action/model-783/model-783-synthetic-heavy-barrel