BT-100 shotguns feature the Invector-Plus choke tube system. The Invector-Plus system is a screw in choke tube system with interchangeable tubes. You can confirm this by reading the inscription on the right side of the barrel.
The words INVECTOR-PLUS mean your shotgun uses the Invector-Plus choke tube system designed for use in Browning 12 gauge shotguns with back-bored barrels. The extra length, combined with special tube tapers, gives the finest possible patterns for target shooters. Plus, you have choke switching convenience. Invector Tubes are fully steel and lead shot compatible. A special "Plus" choke tube wrench is provided to remove and tighten these tubes.
CAUTION: INVECTOR-PLUS TUBES ARE FOR USE IN BROWNING SHOTGUNS WITH BROWNING BACK-BORED BARRELS ONLY, AND ARE NOT INTERCHANGEABLE WITH REGULAR 12 GAUGE INVECTOR CHOKE TUBES. DO NOT USE INVECTOR PLUS TUBES IN BARRELS THREADED FOR STANDARD INVECTOR TUBES. DO NOT USE STANDARD INVECTOR TUBES IN BARRELS THREADED FOR INVECTOR PLUS
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