Invectorplus Choke Tube System

New model BT-99 shotguns feature a barrel fitted with the Invector-Plus™ choke tube system. Older BT-99s may also have the Standard Invector™ tube system or a conventionally choked barrel. 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.

FIGURE 26

FIGURE 27

FIGURE 26

Chokes Invector Plus

FIGURE 27

Choke Notch Meaning

Modified Imp. Cylinder

Skeet A — Invector Plus™ choke tube B — Standard Invector™ choke tube

MARKING ON BARREL

TYPE OF CHOKE

Invector™

Standard Invector Choke Tube System

Invector-Plus™

Invector-Plus Back-Bored Choke Tube System

No Choke Marking on Barrel

Conventionally Choked Barrel

Available 12 Gauge Invector-Plus™ tubes:

RIM NOTCHES CHOKE DESIGNATION CHOKE DESIGNATION

WITH LEAD WITH STEEL

RIM NOTCHES CHOKE DESIGNATION CHOKE DESIGNATION

WITH LEAD WITH STEEL

X on side of tube

X-Full Special

*

I

Full

**

II

Improved Modified

Full

III

Modified

Improved Modified

IIII

Improved Cylinder

Modified

IIIII

Skeet

Improved Cylinder

No notches

Cylinder

Cylinder

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 retain the same choke switching convenience of the Standard Invector system. Invector choke tubes are all fully steel and lead shot compatible. A special 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 (.745" + 0 - .005), and are not interchangeable with 12 gauge Standard 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 tubes. Failure to follow these warnings may cause damage to your gun and cause injury to yourself and others.

NOTE: If your BT-99 has Standard Invector or Invector-Plus choke tubes, carefully adhere to the following instructions.

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Responses

  • Cain Boyle
    Does my bt99 take invector plus choke tubes?
    9 years ago
  • Feorie
    What is an shotgun invector?
    9 years ago
  • esther
    Can invector plus tubes be used in invector barrels?
    8 years ago
  • Vito
    What choke tubes does the bt99 trap come with?
    8 years ago
  • taimi
    Can you install choke tubes in an older browning bt99?
    8 years ago
  • Anya
    Can i use standard invector choke tubes in my bt99?
    3 years ago
  • david stevens
    What year did BT99 have investor chokes?
    2 years ago
  • hamilcar
    What choke tube for bt99?
    1 year ago
  • yvonne schwab
    When buying a browning BT99 Plus what chocke tube comes standared?
    30 days ago

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