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This is not threaded, it has a fixed choke. Hope this helps.

Michael, this model has a 3" Chamber (.410 Chamber) & Fixed Cylinder Bore/Choke. Also a 20" Carbon Steel 20 inch 22WMR Barrel with a 1:16" Right Hand Twist (.22 WMR Barrel). Cheers and stay safe!

Michael, the .410 barrel is a fixed cylinder bore. Have a great day!