Trijicon® TA51 ACOG® Dual-Thumbnut Flattop Mount – MIL-STD-1913 Picatinny Rails – AC12001
The Trijicon® TA51 ACOG® Dual-Thumbnut Flattop Mount (AC12001) is the official, combat-proven factory mounting interface engineered to rigidly secure full-sized Advanced Combat Optical Gunsights (ACOG®) and VCOG® weapons systems directly onto modern MIL-STD-1913 Picatinny rails. While cheap aftermarket scope bases often utilize inferior castings that shift under heavy directional recoil forces—causing zero-drift and point-of-impact migration—the TA51 is the military gold standard for structural consistency. This baseline platform adapter (719307300514) serves as the definitive hardware anchor for ensuring your primary combat optic maintains absolute tracking authority under severe field abuse, extreme thermal drops, and heavy weapon vibration loops.
Precision CNC-machined from high-strength, premium **6061-T6 structural aircraft-grade aluminum** and armored in a defense-grade Type III hardcoat anodized matte black treatment, this ultra-robust mount is designed to shrug off corrosive chemical solvents, extreme elements, and field scratches. The mechanical hallmark of the AC12001 framework is its dual **oversized heat-treated steel thumbnut fastening system**. These heavy-duty thumbnuts feature deep outer ridges alongside integrated screwdriver slots, giving operators the freedom to securely torque-lock the base onto a rail by hand in the field or with a basic multi-tool on the bench. The undercarriage architecture incorporates two precision-ground, solid steel square recoil lugs that index perfectly into your receiver's Picatinny cross-slots, entirely eliminating forward and rearward mounting movement while tracking predictable, sub-MOA return-to-zero performance if the optic is stripped and reinstalled during administrative maintenance. Weighing a lean 2.89 ounces, this turn-key factory upgrade delivers unyielding mechanical security for professional duty setups, long-range precision carbines, and hard-use tactical builds.
Includes: (1) Trijicon TA51 Dual-Thumbnut ACOG Flattop Mount (Matte Black Aluminum), (2) Heat-Treated Carbon Steel Cross-Bolts & Thumbnuts, and (2) Optic-to-Base Screws with Washers.
*Compatibility Note: This mount is custom-contoured EXCLUSIVELY to fit the base housing profiles of full-sized Trijicon ACOG models (including the 3.5x35, 4x32, and 5.5x50 series) as well as the VCOG® 1-6x and 1-8x series. It attaches directly to any standard MIL-STD-1913 Picatinny top rail. It is NOT compatible with Compact ACOG models (such as the TA44 or TA31 micro series) which require alternative compact base layouts.
Key Features
- Dual-Thumbnut Field Fastening: Heavy-duty oversized thumbnuts feature deep ridges and multi-tool flats, allowing quick, tool-free field installation or high-torque security adjustments.
- Solid Steel Square Recoil Lugs: Integrated hardened cross-bolts act as twin square recoil bosses, engaging rail channels perfectly to arrest forward and rearward scope movement.
- Premium 6061-T6 Aircraft Aluminum: Monolithic billet aluminum base provides an unyielding, warp-free interface between your optic's prism housing and the weapon lower receiver.
- Military-Spec Return-to-Zero Tracking: Precision-milled alignment tracks guarantee highly consistent, sub-MOA optical zero retention when stripping and remounting the base.
- Type III Hardcoat Anodized Armor: Deep matte black chemical finish shields underlying aerospace metal from salt spray, field handling friction, and copper-stripping solvents.
- Genuine Wixom Factory Original: Authentic Trijicon OEM hardware pack ensures exact dimensional tolerancing to protect your high-end combat optic's structural warranty.
Product Specifications
- Brand: Trijicon®
- Product Line: Combat Optic Base Adapters
- Model Name: TA51 ACOG Flattop Mount
- SKU / MPN: AC12001 (Alternative Factory Reference: TA51 / 700018)
- Mounting Interface: Standard MIL-STD-1913 Picatinny / Flattop Rails
- Optic Body Compatibility: Full-Sized ACOG (3.5x35, 4x32, 5.5x50) & VCOG Series
- Chassis Base Material: 6061-T6 Billet Structural Aluminum
- Fastener Bolt Chemistry: Heat-Treated High-Tensile Carbon Steel
- Finish Treatment: Matte Black Type III Class 2 Hardcoat Anodization
- Fastening Style: Dual Ridged Thumbnuts with Screwdriver slots
- Optic Mounting Hardware: Included (2x Socket Screws and 2x Washers)
- Country of Origin: Proudly Made in the USA (Wixom, Michigan)
- Overall Mount Length: ~3.50 Inches (88.9 mm)
- Product Net Base Weight: 2.89 oz (81.9 g) with hardware
- UPC: 719307300514
