Description
There is a reason the A400 Xtreme Plus keeps showing up in duck blinds year after year, and this 20 gauge version brings all of that pedigree in a lighter, quicker-swinging package. At the heart of it is Beretta's Blink gas system, which cycles fast, runs clean, and shrugs off the cold, wet, muddy conditions that make lesser autoloaders sulk. The 3-inch chamber handles everything from light field loads to full-house waterfowl shells, and the 3+1 capacity keeps you in the game when a flock commits.
Kick-Off Mega Makes the A400 Xtreme Plus a Pleasure to Shoot
The KO in the name stands for Kick-Off Mega, Beretta's hydraulic dampening system built right into the stock. Paired with a Micro-Core recoil pad and a soft comb that cushions your cheek, it takes the sting out of heavy loads and keeps your face planted on the stock shot after shot. In a 20 gauge that was already gentle to begin with, the result is a gun you can shoot all weekend without thinking twice. New hunters, smaller-framed folks, and anyone tired of getting beat up by a 12 gauge will appreciate the difference immediately.
A 28-Inch Steelium Plus Barrel Built for Real Patterns
Beretta's Steelium Plus barrel uses lengthened forcing cones to smooth out the shot charge, which translates to more even patterns downrange and a softer push at the shoulder. Up top you get a stepped rib with a fiber optic front bead and integral mid bead for a clean, repeatable sight picture, and five extended Optima-Choke HP tubes (F, IM, M, IC, C) let you tune the gun for anything from decoying teal to passing geese.
Ready for the Marsh, Literally
The Gore Optifade Marsh camo covers the stock and receiver to break up your outline in flooded timber and cattails, while Beretta's Aqua Tech Shield treatment protects metal surfaces from water, salt, and grime. The enlarged loading port, extended charging handle, and oversized bolt release are all easy to run with cold, gloved hands. This is a serious waterfowl tool that happens to be downright fun to carry.
Key Specifications
- Manufacturer: Beretta
- Model: A400 Xtreme Plus KO
- MPN: J42XM28
- UPC: 082442965024
- Action: Semi-Auto (Blink Gas Operated)
- Gauge: 20 Gauge
- Chamber: 3"
- Barrel Length: 28" Steelium Plus, Stepped Vent Rib
- Capacity: 3+1
- Chokes Included: F, IM, M, IC, C (Extended Optima-Choke HP)
- Sights: Fiber Optic Front Bead, Steel Mid Bead
- Stock: Synthetic with Kick-Off Mega Recoil System
- Finish: Gore Optifade Waterfowl Marsh Camo
- Safety: Crossbolt
- Metal Protection: Aqua Tech Shield Coating
What’s Included
- Beretta A400 Xtreme Plus KO 20 Gauge Shotgun
- Five extended Optima-Choke HP tubes (F, IM, M, IC, C)
- Owner's manual
Frequently Asked Questions
What does the KO mean on the Beretta A400 Xtreme Plus KO?
KO refers to Beretta's Kick-Off Mega recoil reduction system built into the stock. It uses hydraulic dampeners along with a Micro-Core recoil pad and soft comb to soak up recoil before it reaches your shoulder and cheek. Combined with the naturally light kick of a 20 gauge, it makes for one of the softest-shooting waterfowl guns you can buy.
Can the A400 Xtreme Plus 20 gauge shoot 3.5-inch shells?
No, this 20 gauge model has a 3-inch chamber. It will run both 2 3/4-inch and 3-inch shells, which covers the full range of modern 20 gauge waterfowl and field loads. The 3.5-inch chambering is only found on the 12 gauge versions of the A400 Xtreme Plus.
What choke tubes come with the A400 Xtreme Plus KO, and can I buy more?
It ships with five extended Optima-Choke HP tubes: Full, Improved Modified, Modified, Improved Cylinder, and Cylinder. That set covers everything from close decoy work to long passing shots. The Optima-Choke HP pattern is common, so aftermarket and specialty tubes from Beretta and other makers are easy to find.
Is a 20 gauge like this really enough gun for ducks and geese?
With modern loads, absolutely. Today's bismuth, tungsten-based, and premium steel offerings have made the 20 gauge a legitimate waterfowl performer, and the Steelium Plus barrel on this gun patterns those loads well. You give up a little payload compared to a 12, but you gain a lighter gun that swings quicker and carries easier on long walks to the blind.


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