Winchester SX4 Stealth 12/76 Shotgun – 71 cm, Invector Plus

Winchester SX4 Stealth 12/76 Shotgun – 71 cm, Invector Plus

Winchester SX4 Stealth 12/76 Shotgun – 71 cm, Invector Plus

  • Brand:WINCHESTER
  • Product Code: SX4 Stealth 12/76 – 71 см, Invector Plus
  • Availability: In Stock
  • 1,055.00 € / 2,063.40 лв.

    1,099.00 € / 2,149.46 лв.
  • 29 09 2026 29 10 2026

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WINCHESTER • SX4 STEALTH • 12/76 • 71 CM • 511266361
Winchester SX4 Stealth Semi-Automatic Shotgun 12/76 • 71 cm • Active Valve • Back-Bored • Invector Plus™

Winchester SX4 Stealth combines the proven gas-operated SX4 platform with a distinctive hunting-green composite stock and forearm, a 71 cm barrel and a 12/76 chamber. This configuration is built around practicality, resistance to demanding outdoor conditions and predictable handling in a wide range of hunting situations.

The exact MoskovHunt version carries manufacturer code 511266361, with a 71 cm barrel, 4+1 capacity and the Invector Plus™ interchangeable choke system. Winchester's Active Valve gas system manages the operating gases automatically, while the Back-Bored barrel geometry is designed to support consistent shot-pattern performance.

12/76 71 cm 4+1 Active Valve Back-Bored Invector Plus™ Green Composite
Exact version: 12/76 • 71 cm • 4+1 • green composite • Invector Plus™ • manufacturer code 511266361.
12/76gauge / chamber
71 cmbarrel length
4+1capacity
3.10 kgweight
INV+Invector Plus™
511266361manufacturer code
Active Valve System
Gas operation designed to adapt to the cartridge load
SX4 Active Valve gas system

Automatic management of the gas-operated action according to the cartridge being used.

What is Active Valve?

SX4 uses a gas piston with Active Valve. The system regulates the operation of the gas action so the shotgun can function with a broad range of suitable loads within the specified gauge and chamber.

For a semi-automatic hunting shotgun, this is an important part of the platform: the action is designed to cycle reliably without requiring the user to manually tune the gas system whenever the load changes.

Back-Bored Barrel
A barrel designed with shot-pattern performance in mind

Winchester uses Back-Bored technology in the SX4 Stealth. The optimised internal barrel geometry is designed to make efficient use of the cartridge and reduce unnecessary pellet deformation as the shot charge travels through the barrel.

71
71 cm barrel

The exact MoskovHunt configuration uses a 71-centimetre barrel.

BB
Back-Bored

Internal barrel geometry developed to support efficient cartridge performance and consistent shot distribution.

6MM
Ventilated rib

The 71 cm version is specified with a 6 mm ventilated rib and fibre-optic front sight.

Invector Plus™
Three interchangeable chokes for adapting the configuration

The barrel uses Winchester's proven Invector Plus™ choke system. This version is supplied with three interchangeable choke tubes, allowing different constrictions to be selected according to the intended use.

IM
3/4 • Improved Modified

The tighter constriction among the supplied choke options.

MOD
1/2 • Modified

A medium constriction and versatile option within the supplied set.

IC
1/4 • Improved Cylinder

The more open constriction among the supplied Invector Plus™ tubes.

Choke and ammunition selection must always comply with the firearm markings, intended use and the manufacturer's instructions.
Stealth Green Composite
Distinctive hunting-green composite furniture

SX4 Stealth differs from the standard black composite variants through its characteristic hunting-green stock and forearm. Winchester specifies that the colour is integrated into the material rather than being only a superficial decorative finish.

GRN
Green Composite

Durable synthetic stock and forearm in the distinctive Stealth green colour.

AL
Aluminium receiver

Winchester uses an aluminium receiver on the SX4 Stealth platform.

MAT
Matte barrel finish

The barrel uses a dark matte finish in keeping with the practical character of the model.

Inflex II Recoil Pad
Stock design focused on comfort and control

The rear of the stock uses Winchester's Inflex II recoil pad. It forms part of the SX4 design concept aimed at more comfortable handling with suitable loads.

INF
Inflex II

Factory recoil pad developed to manage perceived recoil during use.

362
362 mm length of pull

The exact 71 cm version is specified with a 362 mm length of pull.

3.1
3.10 kg

A weight that keeps the shotgun stable without unnecessary bulk.

12/76 • 4+1
Classic 12-gauge Magnum configuration

This SX4 Stealth is chambered in 12/76. The stated capacity is 4+1; all applicable legal restrictions and rules for the relevant hunting activity must always be observed.

12
12 gauge

One of the most widely used gauges for semi-automatic hunting shotguns.

76
76 mm chamber

12/76 configuration for the exact MoskovHunt model.

4+1
4+1 capacity

Factory-stated capacity of the model, subject to applicable legal restrictions.

Technical Specifications
Winchester SX4 Stealth 12/76 • 71 cm • 511266361
Brand
Winchester
Model
SX4 Stealth
Manufacturer code
511266361
Type
Semi-automatic smoothbore hunting shotgun
Gauge / chamber
12/76
Barrel length
71 cm
Action
Gas-operated semi-automatic
Gas system
Active Valve System
Barrel technology
Back-Bored
Choke system
Invector Plus™
Included chokes
3/4 (IM), 1/2 (MOD), 1/4 (IC)
Rib
Ventilated, 6 mm
Front sight
Fibre-optic
Stock and forearm
Green Composite
Length of pull
362 mm
Recoil pad
Winchester Inflex II
Receiver
Aluminium
Barrel finish
Dark matte finish
Capacity
4+1
Weight
Approx. 3.10 kg
Packaging
Cardboard box
Factory equipment

For the SX4 Stealth series, Winchester specifies a choke wrench, sling swivels, stock spacer and locking device. The exact contents supplied with the available firearm can be confirmed at MoskovHunt.

TBI Bank
Instalment purchase option

Winchester SX4 Stealth is available with an instalment purchase option through TBI Bank, subject to approval and the current terms of the financial partner.

TBI Bank financing

Details regarding available terms, monthly instalments and conditions can be provided at the MoskovHunt retail store.

Important Information
Purchase only at the MoskovHunt retail store
FAQ • Winchester SX4 Stealth
Frequently asked questions
Which exact SX4 Stealth version is this?

This is the 12/76 version with a 71 cm barrel and manufacturer code 511266361.

How does the action operate?

SX4 Stealth is a gas-operated semi-automatic shotgun using Winchester's Active Valve System, which manages the gas system according to the suitable load being used.

Which choke system does it use?

The shotgun uses Invector Plus™. This version is specified with 3/4 (IM), 1/2 (MOD) and 1/4 (IC) choke tubes.

What does Back-Bored mean?

It is Winchester's barrel-bore technology designed to make efficient use of the cartridge and support consistent shot-pattern performance.

What type of stock does it have?

The stock and forearm are made from green composite material characteristic of the Stealth version.

How much does it weigh?

The exact 71 cm configuration is specified at approximately 3.10 kg.

Is instalment purchase available?

Yes. Instalment purchase through TBI Bank is available subject to approval and the current financing conditions.

Can Winchester SX4 Stealth be purchased online?

No. This is a firearm and purchase is completed only at the MoskovHunt retail store in compliance with all applicable legal requirements.

Winchester SX4 Stealth – Active Valve, Back-Bored and Invector Plus™ in a distinctive green configuration

12/76 chamber, 71 cm barrel, 4+1 capacity, Active Valve gas system, Back-Bored barrel, three Invector Plus™ chokes, fibre-optic front sight and green composite stock – exact version 511266361.

MoskovHunt • Levski, 37 Tsar Simeon Str., 5900 089 446 2621 – Viber/WhatsApp 089 681 1177 – Viber/WhatsApp gmoskov@mail.bg



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