T3 Shotgun Stock Adapter for Winchester 1200/1300 12ga & 20ga (proud fit)

Why Choose the ATI T3 Shotgun Stock Adapter for Winchester 1200/1300?

The ATI T3 Shotgun Stock Adapter is designed specifically to connect compatible ATI T3 stock systems to Winchester 1200 and 1300 shotguns.

It provides the model-specific interface needed to install a T3 stock on these Winchester platforms while retaining the adjustability, ergonomics and recoil-management features of the ATI stock system.

Purpose-Built for Winchester 1200/1300 Shotguns

The A.5.10.2558 is designed for Winchester 1200 and 1300 shotguns in both 12-gauge and 20-gauge configurations.

Rather than relying on a universal mounting solution, the adapter is shaped specifically around the Winchester receiver interface so the ATI T3 system can be installed correctly.

Required for Compatible T3 Stock Installations

ATI T3 shotgun stock systems use different adapters to match different shotgun receivers.

For Winchester 1200/1300 applications, this adapter provides the correct connection between the shotgun and the ATI T3 pistol-grip/stock assembly.

If you already own a compatible T3 stock and want to move it to a Winchester 1200 or 1300, the A.5.10.2558 provides the model-specific component needed for the conversion.

Designed to Maintain Proper Stock Alignment

The adapter seats inside the T3 pistol grip and positions the grip and stock assembly against the Winchester receiver.

This helps create the proper interface between the firearm and the ATI stock system so the stock can be securely mounted using the appropriate hardware.

Replacement or Conversion Component

The A.5.10.2558 can be used as a replacement for a lost or damaged Winchester adapter or as the required component when converting an existing compatible T3 stock system to a Winchester 1200/1300 shotgun.

This makes ATI's modular stock system more versatile by allowing compatible components to be used across supported shotgun platforms.

Proud-Fit Design

On Winchester 1200 and 1300 shotguns, the T3 adapter uses a proud-fit configuration.

This means the adapter or grip interface may extend slightly beyond the receiver profile while still providing the intended mounting arrangement.

Always review the ATI Fitment tab before ordering so you know what to expect from the finished installation.

The ATI Advantage

ATI designs its shotgun stock systems around interchangeable, model-specific adapters rather than forcing one universal receiver connection to fit every firearm.

The T3 Winchester 1200/1300 Adapter gives owners a purpose-built way to use a compatible ATI T3 stock on these established Winchester shotgun platforms, making it easier to replace hardware, convert an existing T3 setup or keep an ATI stock system in service for years to come.