Its a full choke see *******Savage Stevens 301 Single Shot Shotgun 410 Bore 26" Barrel 3" Chamber ******Full Choke Synthetic Stock Black Specifications and Features
Savage 19201
.410 bore
Break action single shot
26" carbon steel barrel
3" chamber
1 round capacity
****Full choke tube
Matte black synthetic field stock
Overall length 45.25"
Black

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Alton, 26" carbon steel barrel with Full choke tube should be sufficient as is. Cheers and stay safe!