The Leupold STD Springfield 1903 A3 1-Piece Base in Matte Black (MPN: 178128, often catalogued in Australia under SKU: LE178128) offers a robust and reliable mounting solution for securing optics to the historic Springfield 1903 A3 rifle. Machined from solid forged steel, this one-piece mounting base provides a secure, low-profile connection that preserves the classic lines of the rifle while delivering modern optical alignment. Although this specific model has been discontinued in the United States, it remains highly sought after by Australian firearm enthusiasts, target shooters, and collectors who maintain and shoot these vintage military surplus platforms. Because this is a purely mechanical steel component, it requires no electrical power, making Australian 240V or RCM/SAA compliance certifications non-applicable.

Key Features:

• Rear Windage Adjustment: The rear section of the base is secured by dual windage adjustment screws. This design allows shooters to make major lateral adjustments directly on the base during the initial bore-sighting process, saving the scope's internal windage adjustments for precise, on-the-fly zeroing in the field.
• Pivoting Front Dovetail: The front ring socket uses a pivoting dovetail connection. This allows the front ring to pivot laterally, aligning perfectly with the rear windage adjustments to prevent stress or binding on the scope tube.
• Forged Steel Construction: Machined from high-tensile forged steel to withstand the recoil of standard hunting and military calibers.
• Shim Compatibility: The base design allows for the placement of shims underneath the mount, which helps preserve the scope's internal elevation travel for long-range Bullet Drop Compensation (BDC) applications.
• Matte Black Finish: Features a durable matte black finish that resists corrosion and matches seamlessly with most modern matte-finished rifle scopes.

Technical Specifications:

• Brand: Leupold
• Model / MPN: 178128 (SKU: LE178128)
• Material: Forged and machined steel
• Finish: Matte Black
• Base Configuration: 1-Piece
• Base Cant: 0 MOA (No built-in elevation)
• Weight: 3.6 ounces (approximately 102 grams)
• Base/Receiver Screw Torque: 22 in-lbs
• Windage Screw Torque: 45 in-lbs
• Compatibility: Engineered specifically for the Springfield 1903 A3 receiver. Designed to pair with Leupold Standard (STD) rings, which are available in five different heights. Recommended for use with standard calibers up to .300 Winchester Magnum.

Who It Is For:

This mounting base is specifically designed for Australian hunters, target shooters, and military surplus collectors who are sporterising or mounting modern optics onto a classic Springfield 1903 A3 rifle. It is ideal for shooters who require a rugged, historically clean-looking steel connection that ensures their optic remains zeroed under field conditions. Whether restoring a family heirloom or setting up a vintage rifle for local target competitions, this base provides the precise alignment and structural integrity needed for consistent accuracy.