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Bismuth has earned a real following among waterfowlers and upland hunters who want a non-toxic load that patterns more like lead and goes easier on older barrels. The catch is that bismuth behaves differently than steel or lead downrange, so it needs a choke tuned specifically for it. That is exactly what the Johnny Stewart RRaptor BIZ choke was designed to do. This 20 gauge tube fits Crio Plus barrel systems and pulls the most consistent, dense pattern possible out of 100 percent bismuth shot.
Bismuth is softer and less dense than steel, which changes how it patterns through a standard choke. Rob Roberts built the BIZ constriction around that behavior, so instead of guessing with a generic tube, you get a choke matched to the shot. One thing worth knowing up front: this choke is meant for 100 percent bismuth only. Blended shot should not go through it, so keep your bismuth loads separate and you will be set.
These tubes are machined from 17-4 PH U.S. stainless steel, the same material Rob Roberts uses across the RRaptor lineup for its strength and corrosion resistance. The company machines to tolerances well beyond the usual industry standard, and every tube is the product of years of development and testing. That translates to a choke that installs clean, holds its dimensions, and shrugs off the moisture that comes with duck blinds and marsh mornings.
This model is cut for the Crio Plus system found on many Benelli 20 gauge shotguns, so confirm your barrel uses that thread pattern before ordering. If you shoot an over/under, keep in mind the RRaptor design only goes in a single barrel; it is not made to run in both at once. For semi-autos and pumps, it is a straightforward swap that gets you patterning bismuth the way it was meant to fly.
This choke is built specifically for 100 percent bismuth shot, which patterns differently than steel or lead. Rob Roberts tuned the BIZ constriction around bismuth's density and softness to get the tightest, most consistent patterns out of it. Do not run blended shot through it, only pure bismuth loads.
This particular model is cut for the Crio Plus choke system, which is found on many Benelli 20 gauge shotguns. Check that your barrel uses the Crio Plus thread pattern before ordering to be sure it seats correctly. Rob Roberts offers the BIZ in other fitments too, so match the choke to your specific barrel system.
No. The RRaptor design is meant to run in a single barrel only and cannot be placed in both barrels of an over/under at the same time. In a two-barrel gun you would pair it with a different tube in the second barrel.
It is machined from 17-4 PH U.S. stainless steel, a strong and corrosion-resistant alloy that holds up well to the wet conditions of waterfowl hunting. That material choice means the tube keeps its dimensions over time and resists the rust and pitting that moisture can cause. It also lets the choke be machined to very tight tolerances for consistent patterning.
| UPC | 810174901979 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 200288 |
| Caliber/Gauge | 20 Gauge |
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