The Biz Raptor choke (MPN 200290) from Rob Roberts Gun Works is built for 20 gauge shotguns on the Browning Invector thread system, tuned for bismuth shot.

Key Specifications

• Biz constriction is tuned to perform with bismuth shot loads
• Machined from 17-4 PH U.S. stainless steel
• Threads into the Browning Invector choke system on 20 gauge shotguns
• Part of Rob Roberts Gun Works’ RRaptor Series
• On over/under and side-by-side shotguns, only one barrel can carry an RRaptor choke at a time

Frequently Asked Questions

What shot type is this choke tuned for?
Bismuth shot.

What thread system does it use?
The Browning Invector system on 20 gauge shotguns.

Can both barrels of my double gun use this choke?
No — only one barrel at a time can carry an RRaptor choke.

Buy the RRaptor Biz Invector Choke

Match your bismuth loads with this 20 gauge Biz choke from Johnny Stewart. Order from a Lubbock, TX gun shop in our shotgun choke lineup.