Invector-Plus Choke Tubes. Barrels marked Invector Plus ( or Invector+) will not accept “DS” or “Standard” Invector.

• These choke tubes only fit Browning shotguns with Invector Plus (+) on the barrel (s).
• They are found on 12 and 20 gauge Browning shotguns and have been a mainstay of Browning performance for over 20 years.
• Multi-gauge sets found on Citori over and unders, will often have a mix of Invector Plus (12 and 20 ga.) and Standard Invector (16 ga., 28 ga. and .410 bore).

Invector Plus features a longer design for improved pattern performance. Considered a significant breakthrough in choke tube design.