Carlson's Buckshot Choke Tubes are designed to deliver tight patterns downrange with 00 and 000 buckshot. This choke is ported to reduce recoil and muzzle jump that tend to go hand in hand with these large loads. This choke features a constriction designed specifically to optimize patterns with large and small loads alike. This choke will extended about 1" out of the barrel and has a black finish. Machined out of 17-4 heat treated steel this choke can be used with Lead, Steel, and Hevi-Shot loads. However, this choke should not be used with any Steel Shot larger than BB or with any Steel shot faster than 1550 FPS.