Carlsons Bismuth Bone Buster 20 Gauge Invector Plus Mid-Range Choke Tube

The Carlsons Bismuth Bone Buster choke tube is purpose-built to produce tight, dense patterns when paired with bismuth shot loads in 20 Gauge shotguns fitted with the Browning Invector Plus choke system. Part of the Bone Buster series, this Mid-Range tube delivers the downrange coverage waterfowl hunters demand and is fully compatible with steel shot as well.

The tube is CNC precision-machined from 17-4 heat-treated stainless steel for corrosion resistance and long service life in harsh field conditions. Carlsons builds the Bone Buster with a longer parallel section inside the choke than a conventional constriction, which is what allows it to keep pellets flying in a tight column rather than spreading them too early.

This Mid-Range choke delivers a .025" constriction and is sold as a single choke tube. It threads directly into any 20 Gauge Browning Invector Plus barrel, making it a straightforward drop-in upgrade for hunters running bismuth or steel loads.