Weaver 48428 Top Mount Base 40A Matte Black BSA/Colt/Remington

The Weaver 48428 Top Mount Base provides a rock-solid foundation for mounting optics on BSA, Colt, and Remington firearms. This precision-machined base transforms standard grooved receivers into versatile platforms ready for scopes, red dots, and other optical equipment.

What Makes This Different

Unlike generic mounting solutions, the Weaver 48428 features the proven 40A profile specifically engineered for proper scope alignment and maximum strength. The matte black finish resists corrosion and eliminates glare that could compromise shooting position. Each base undergoes rigorous quality control to ensure consistent dimensions and reliable performance across thousands of mounting cycles.

Key Features

• Precision-machined aluminum construction for lightweight durability
• 40A profile provides standard Weaver/Picatinny compatibility
• Matte black anodized finish resists wear and corrosion
• Compatible with BSA, Colt, and Remington grooved receivers
• Low-profile design maintains clean sight lines
• Steel mounting screws included for secure installation
• Reversible design accommodates various scope configurations

Field testing demonstrates the 48428's ability to maintain zero through repeated mounting and dismounting cycles. The aluminum construction shaves weight compared to steel alternatives while providing sufficient strength for hunting rifles, tactical applications, and competition shooting. Weather resistance testing confirms the anodized finish withstands exposure to moisture, temperature extremes, and chemical solvents commonly encountered in the field.

Technical Specs

• Material: Precision-machined aluminum alloy
• Finish: Matte black anodized
• Profile: Weaver 40A standard
• Compatibility: BSA, Colt, Remington grooved receivers
• Mounting hardware: Steel screws included
• Weight: Approximately 2.1 ounces
• Country of Origin: United States
• Manufacturer: Weaver Optics

Professional gunsmiths and serious shooters recognize Weaver's reputation for manufacturing mounting solutions that deliver consistent performance. The 48428 represents decades of engineering refinement in a package that installs quickly and performs reliably when accuracy matters most.