Carlsons Bismuth Bone Buster 20 Gauge Extended Range Remington Rem Choke 17-4 Stainless Steel Choke Tube

The Carlsons Bismuth Bone Buster choke tube is purpose-built for hunters running bismuth shot through shotguns threaded in the Remington Rem Choke pattern. Part of Carlson's dedicated Bone Buster line, this choke is engineered specifically to wring dense, even patterns out of bismuth loads — a payload that notoriously over-patterns and spreads in conventional factory chokes.

This 20 Gauge tube is CNC precision machined from 17-4 heat-treated stainless steel, the same corrosion-resistant alloy Carlson's uses across its premium choke lineup. The defining feature of the Bone Buster series is a longer parallel section inside the choke compared to standard factory tubes, giving the bismuth shot column a tighter, more uniform constriction window before it exits the barrel. The payoff is denser downrange patterns at distance — ideal for waterfowl hunters and extended-range upland work.

Configured for Remington Rem Choke threads with an Extended Range constriction rated at .040", this single choke tube installs in any 20 gauge Remington-choke-compatible barrel. The polished 17-4 PH stainless steel construction resists corrosion through wet, salty waterfowl environments and many seasons of hard use.