SGM Tactical Vepr Shotgun External Thread Choke - Full. SGM Tactical meticulously builds these Shotgun Chokes with 4140 heat treated steel and a tough black oxide finish. SGM Tactical Vepr Shotgun Chokes w/ External Threading can accommodate a variety of muzzle attachments. If you're looking to get the best competition performance out of your Vepr shotgun check out these great SGM Tactical External Threaded Chokes. Specifications for SGM Tactical Vepr Shotgun External Thread Choke Tube: Manufacturer: SGM Tactical Finish: Black Oxide Fabric/Material: 4140 heat treated steel Gauge: 12 Quantity: 1 Condition: New Features of SGM Tactical Vepr Shotgun External Thread Choke SGMT: 4140 Heat Treated Steel Black Oxide Finish Package Contents: SGM Tactical External Thread Choke Vepr Shotgun SGMT SGM Tactical SGMTFCET: Vepr Shotgun External Thread Choke - Full