Description
The Beretta A400 Xtreme Plus Shadow Grass is a 12 gauge semi-automatic shotgun dressed for open water. Mossy Oak Original Shadow Grass covers the receiver, the 26-inch Steelium Plus barrel, the stock and the forend, breaking the gun’s outline against reeds, cattails and flooded grass rather than timber. It is the pattern to pick when the blind sits in a marsh instead of under a canopy.
Built around a 3.5-inch chamber and a 2+1 magazine, the Beretta A400 Xtreme Plus Shadow Grass carries part number J42XW16 and is a right-hand gun with a vented rib and Kick-Off recoil reduction in the buttstock. The Blink gas system drives the action, and it will cycle 2.75-inch target loads as readily as heavy magnums.
Where the Beretta A400 Xtreme Plus Shadow Grass belongs
- Mossy Oak Original Shadow Grass across every external surface, including the barrel and vented rib
- 26-inch Steelium Plus barrel with an extended forcing cone for softer, more even patterns
- 3.5-inch chamber for goose loads, with no adjustment needed to run light target shells
- Kick-Off hydraulic dampers in the stock, which take the sting out of a long morning
- Blink gas operating system, built to keep cycling when the temperature drops
- Enlarged bolt handle, bolt release and safety that a gloved hand can still find

Choosing 26 inches on the Beretta A400 Xtreme Plus Shadow Grass
- Quicker to bring up in a layout blind or a low-sided boat than a 28-inch gun
- Balances a touch rearward, which most shooters read as livelier between the hands
- Gives up a little pointing stability at long range in exchange for speed on close birds
- Patterns steel and bismuth well through an extended choke despite the shorter tube
- Easier to carry across a mile of picked field or through standing cover
Specifications
- Manufacturer: Beretta USA
- Part number: J42XW16
- Gauge: 12
- Chamber: 3.5 inch
- Barrel length: 26 inches
- Barrel: Steelium Plus with vented rib
- Capacity: 2+1
- Stock: Mossy Oak Original Shadow Grass synthetic with Kick-Off
- Finish: Mossy Oak Original Shadow Grass, overall coverage
- Action: Blink gas-operated semi-automatic
- Hand: Right
- UPC: 082442027692
Loads, chokes and the 3.5-inch question
On the Beretta A400 Xtreme Plus Shadow Grass the 3.5-inch chamber is headroom rather than a requirement. Most marsh hunting is done with 3-inch steel, and the longest shells earn their place on late-season geese or high birds. Shotshell dimensions and pressure ceilings are published by SAAMI, and staying inside them is the cheapest insurance a gas gun can have.
For non-toxic shot, Apex Waterfowl TSS Blend carries far more energy downrange than its pellet count suggests, while B&P Dual Bismuth is kinder to older chokes and pairs well with decoying birds inside 35 yards.
Keeping it running in the cold
A gas gun proves itself in the last hour of a freezing morning. The self-cleaning piston on the Beretta A400 Xtreme Plus Shadow Grass pushes fouling forward instead of packing the gas cylinder, so the gun still cycles after three boxes of steel. Beretta’s Aqua Technology surface treatment stands up to salt spray and standing water better than a conventional finish, which matters on coastal hunts and in brackish marsh.
Maintenance is short. Wipe the exterior dry before the gun goes back in the case, run a patch through the bore, and clean the piston and gas cylinder every few hundred rounds. Leave the choke tube installed and lightly greased so the threads never seize.
Why this shotgun earns its place
- Full-coverage camouflage leaves no blued steel to rust and no gloss to flash in low sun
- A day of 3.5-inch loads through the Beretta A400 Xtreme Plus Shadow Grass stays comfortable thanks to gas operation and Kick-Off
- Steelium Plus bore geometry is borrowed from Beretta’s competition guns, not invented for the camo market
- Shadow Grass reads better than a timber pattern in open marsh, rice and grass flats
- Chokes, parts and factory service are easy to find across the United States
The Beretta A400 Xtreme Plus Shadow Grass suits the hunter whose season is spent over open water and grass, and who would rather swing a 26-inch barrel than a 28. If your ground is timber or mud flats, the Bottomland version and the Optifade Marsh version share the same action and barrel, and the walnut-stocked A400 Upland puts it in a field gun.
All firearm purchases ship to a licensed dealer and require a completed background check. Contact MAG5 Firearms if you need help arranging the transfer.






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