INVECTOR-PLUS CHOKE TUBE SYSTEM is equipped with an extended, ported door-breacher choke tube.this is from Winchester website.

This comes with a breacher choke. (Specifications and Features): 12 gauge-- Inertia-assisted pump action-- 18" barrel-- 5 rounds capacity-- 3" chamber-- >>>>>>>>>Breacher choke-- Rifle style ghost ring sights-- MIL-STD 1913 Picatinny rail for optics mount-- MIL-STD 1913 Picatinny rail on forend for mounting light or laser -- Synthetic stock-- Length of pull 13.75"-- Overall length 38.5"-- Weight 7.5 lbs -- Black

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Hi Mike This comes with a breacher choke. (Specifications and Features):
12 gauge--
Inertia-assisted pump action--
18" barrel--
5 rounds capacity--
3" chamber--
>>>>>>>>>Breacher choke--
Rifle style ghost ring sights--
MIL-STD 1913 Picatinny rail for optics mount--
MIL-STD 1913 Picatinny rail on forend for mounting light or laser --
Synthetic stock--
Length of pull 13.75"--
Overall length 38.5"--
Weight 7.5 lbs --
Black