Carlson's Choke Tubes 13399 Buckshot Remington Rem Choke 12 Gauge Ported 17-4 Stainless SteelCarlson's Ported Buckshot choke tube is designed to give you tight patterns downrange with 00 & 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 material this