The Carlsons 18899, a ported Buckshot choke tube by Carlson, is designed to deliver consistent, tight shooting patterns with 00 & 000 buckshot. It\'s ported feature is intended to lessen the recoil and muzzle jump typically associated with larger loads.The contraption boasts a design that accommodates both large and small loads to optimize patterning. It extends approximately 1\" out from the barrel, ensuring an effective shooting experience. Featuring a construction from 17-4 heat treated material, the choke manifests a remarkable range of versatility, allowing compatibility with Lead, Steel, and Hevi-Shot loads.Please note, however, that this choke is not suitable for use with any Steel Shot larger than BB or with any Steel shot exceeding a speed of 1550 FPS.