Winchester SX4 Composite Inv.+

The Winchester SX4 Composite is considered one of the fastest semi-automatic shotguns in the world.

The SX4 is the culmination of an ongoing joint development of the gas-operated shotgun by Winchester and Browning since the initial introduction of the Super-X (SX) series in 1974. With its back-bored barrels (66 cm, 71 cm, or 76 cm), the three Invector Plus™ chokes, the TruGlo™ sight with a long front bead, the recoil-reducing "Quadra-Vent™" system for venting combustion gases, and the Inflex™ stock cap technology for recoil minimization, the SX4 series showcases the full expertise of Winchester engineers. The stock of the SX4 Composite, made of black composite material, completes the concept of the SX4 series in terms of weight, ergonomics, and durability. The SX4 Composite is a technologically advanced semi-automatic shotgun with eminently practical features.

Active-Valve-System™
The SX4 is a gas-operated shotgun. Two openings in the barrel vent a portion of the propellant gas, which is used for the cycling process. Low propellant loads can therefore lead to malfunctions, as the amount provided is not sufficient for the cycling process. Winchester has solved this problem with the new Active-Valve-System, which fires loads from 28 g to 56 g without malfunctions and additionally keeps the system sealed and clean with the three existing rubber seals. Only as much gas is vented as is necessary for the operation of the system, and the excess is vented through the four Quadra-Vent ports near the fore-end.

Trigger and Safety
The safety is located on the trigger guard in front of the trigger and is disengaged or engaged by pressing from right to left with the trigger finger. A conversion for left-handed shooters is easily possible here. A red outline, which is only visible when the safety is disengaged, provides an additional visual signal. The ergonomic orientation of the safety button allows the shooter to develop an automatic response in no time, as the positioning is in a natural position, making the disengagement of the weapon reflexive after a short time. The trigger blade is pleasantly large, ensuring that even with winter clothing, the necessary tactile feedback is achieved. The trigger group can be quickly removed as a unit for cleaning by pushing out two pins. It can be reassembled in no time thanks to a self-aligning bolt holder connection.

Barrel
The barrel of the Winchester SX4 Composite is manufactured with a length of 71 cm or 76 cm. The barrel is equipped with a 6 mm wide ventilated rib that carries a sight with a long front bead. The top of the rib is finely guilloched. The barrel and chamber are hard-chromed on the inside, providing optimal rust protection. A special highlight is the Back-Bored™ barrel technology. The shotgun barrel slightly tapers from back to front, resulting in a smoother transition at the choke. This measurably increases shot speed, significantly reduces recoil, and greatly improves coverage.

Stock and Magazine
The fore-end of the Winchester SX4 Composite fits comfortably in the hand due to its ergonomic design. The slim stock allows the shooter's hand to be very close to the sight line, promising exceptional maneuverability. At the end of the tubular magazine, there is a closure cap that can be easily unscrewed. Under this closure cap is the Turnkey, a pin that prevents the magazine from being loaded with more than two cartridges at once. The buttstock contributes to the perfect balance of the semi-automatic shotgun, allowing it to swing smoothly. Additionally, the stock length can be varied with spacers and adjusted to the shooter. The buttstock is finished with a recoil-reducing stock cap, which reduces recoil due to its Inflex™ technology.

Inflex™
The buttstock of the Winchester SX4 Composite is equipped with the Inflex™ system, which dampens perceived recoil. The construction of the shotgun, combined with the Inflex spacers that can be attached individually or as a group, directs the energy of the recoil downward. This also minimizes the muzzle rise of the semi-automatic shotgun. The Inflex™ spacers are made of recoil-absorbing synthetic material and are available in different thicknesses.

Scope of delivery: Choke wrench, 3 inv+ chokes (1/4, 1/2, 3/4), stock spacers

Caliber: 12/89, 20/76

Technical data:

Shotgun type: Semi-automatic shotgun, gas-operated
Proof: Steel shot compatible
Safety: Trigger safety
Barrel length: 66 cm, 71 cm, or 76 cm
Rib width: 6 mm
Barrel finish: Blued, matte
Sight: Bead sight
Chokes: 3 Invector-Plus™ interchangeable chokes
Material receiver: Aluminum
Action: Semi-automatic action
Magazine capacity: 2 + 1 or 4 + 1
Material stock: Composite material
Stock shape: Pistol grip
Stock length: 36.5 cm
Drop at comb: 44 mm
Drop at heel: 51 mm
Stock cap: Inflex II™ stock cap
Weight: 3.0 kg