Trijicon AC12001 ACOG Flattop Matte Black Aluminum 3.50" Picatinny Rail Mount

The Trijicon AC12001 ACOG Flattop Mount is the factory mounting solution for attaching an ACOG riflescope to a flat-top firearm with a MIL-STD 1913 Picatinny rail. Also sold under the TA51 designation, this dedicated flattop adapter is machined from durable aluminum and finished in a low-glare matte black to match your optic and rifle.

Designed specifically for Trijicon's ACOG family, the Flattop Mount fits 3.5x35, 4x32, and 5.5x50 ACOG models, as well as the 1x42 Reflex (when paired with ACOG bases) and the 1-6x24 VCOG. The mount secures to your rail with two thumbscrews in the classic Colt-style knob configuration for a fast, repeatable install without tools. At just 3.50" long and weighing approximately 4.0 oz, it adds minimal bulk to your rifle while providing a rock-solid, returnable zero platform for combat optics.

Built to Trijicon's exacting standards, this ACOG Flattop Mount ensures your optic sits at the correct height for proper cheek weld and consistent eye relief across MIL-STD 1913 and NATO-spec rails. Rings are not included and not required; this is the dedicated Trijicon mounting base for the ACOG line.