Description
The Beretta A400 Xtreme Plus Shadow Grass Left Hand is a mirrored gun, not a right-hand shotgun with a reversed safety. The ejection port is cut into the left side of the receiver, the bolt handle sits on the left, and the stock is cast for a left shoulder. Empties throw away from the face rather than across it, and the whole gun wears Mossy Oak Original Shadow Grass for open marsh, reeds and flooded grass.
Built around a 3.5-inch chamber and a 2+1 magazine, the Beretta A400 Xtreme Plus Shadow Grass Left Hand carries Beretta part number J42XW18L and is a left gun with a vented rib and Kick-Off recoil reduction in the buttstock. The Blink gas system drives the action, and it cycles light target loads as readily as heavy magnums.
Where the Beretta A400 Xtreme Plus Shadow Grass Left Hand belongs
- Mossy Oak Original Shadow Grass across every external surface, including the barrel and vented rib
- 28-inch Steelium Plus barrel with an extended forcing cone for softer, more even patterns
- 3.5-inch chamber, with no adjustment needed to run lighter 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

What a true left-hand receiver changes
- Ejection port on the left, so hulls clear away from a left-handed shooter’s cheek
- Bolt handle and bolt release reached without breaking the firing grip
- Stock cast toward the left shoulder, so the rib lines up without tilting the head
- Nothing crossing the sight picture on a second shot at a bird that flared
- Same 28-inch Steelium Plus barrel and 3.5-inch chamber as the right-hand model
Specifications
- Manufacturer: Beretta USA
- Part number: J42XW18L
- Gauge: 12
- Chamber: 3.5 inch
- Barrel length: 28 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: Left
- UPC: 082442027753
Loads, chokes and the 3.5-inch question
On the Beretta A400 Xtreme Plus Shadow Grass Left Hand the 3.5-inch chamber is headroom rather than an obligation. Most hunting is done with 3-inch shells, and the longest loads earn their place on late-season birds at distance. 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 more energy downrange than its pellet count suggests, while B&P Dual Bismuth is kinder to older chokes and suits 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 Left Hand 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
- A genuine left-hand action, which very few makers still build in a camouflage waterfowl gun
- Shadow Grass reads correctly in reeds, rice and flooded grass, where a timber pattern stands out
- Gas operation and Kick-Off keep a day of 3.5-inch loads through the Beretta A400 Xtreme Plus Shadow Grass Left Hand comfortable
- Full-coverage camouflage leaves no blued steel to rust in a wet blind
- Standard Beretta chokes, parts and service apply exactly as they do to the right-hand gun
This is the gun for the left-handed marsh hunter who has spent years ducking brass from a right-hand autoloader. Left-handed shooters who hunt timber should look at the Bottomland left-hand model; right-handed shooters are covered by the 28-inch Shadow Grass and the 26-inch Shadow Grass.
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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