The Trijicon ACOG 3x30 BAC Riflescope TA33-C-400164 is a compact fixed-power ACOG built around the cartridge that needs a dedicated reticle more than almost any other AR cartridge: .300 Blackout. This model uses a red crosshair .300 BLK bullet drop compensating reticle designed around both 115gr supersonic and 220gr subsonic load references.

The Clear ACOG Choice for .300 Blackout: A generic 5.56 NATO or .308 BDC reticle does not properly address the wide ballistic gap between .300 Blackout supersonic and subsonic ammunition. The TA33-C-400164 solves that problem with a dedicated .300 BLK reticle that gives the shooter separate visual references for supersonic and subsonic use instead of forcing a compromise reticle onto a dual-purpose cartridge.

Dedicated .300 BLK BDC Reticle: The reticle image shows a 100 meter supersonic zero, with additional supersonic holds for 200, 300, 400, 500, and 600 meters. It also includes separate subsonic references for 50 meters and 100 meters, along with 19 inch ranging brackets marked for longer distances. That makes this optic especially useful for .300 Blackout rifles that may be used with both supersonic and subsonic ammunition.

Why the Reticle Matters: .300 Blackout is commonly used in short-barreled rifles, suppressor-ready carbines, defensive carbines, hunting rifles, and general-purpose AR builds. Supersonic loads and subsonic loads do not share the same trajectory. This ACOG gives the shooter a purpose-built aiming system for both load types, making it far more practical on a .300 BLK rifle than a standard rifle scope or a BDC designed around another cartridge.

3x30 Compact ACOG Format: The TA33 ACOG format gives the shooter fixed 3x magnification in a compact, lightweight optic. It provides enough magnification for target identification and practical field shooting while remaining fast and simple for close-to-mid-range carbine use.

RMR Piggyback Mount Capability: The TA33 ACOG body has integrated top mounting bosses that allow installation of a compatible Trijicon RMR mount, such as the RM54-style mount for 3x30 ACOG models with bosses. This gives the shooter the option to run the dedicated 3x .300 Blackout BDC reticle for distance work while adding a top-mounted RMR for fast close-range aiming.

Battery-Free Illumination: Trijicon’s dual illumination system uses fiber optics for daylight reticle visibility and tritium for low-light illumination. There are no batteries to manage, no brightness buttons to press, and no electronic power system to fail at the wrong time.

Bindon Aiming Concept: The ACOG 3x30 BAC design supports both-eyes-open shooting for faster target acquisition and improved situational awareness. This is especially useful on compact .300 Blackout rifles where speed, simplicity, and reliability matter.

TA51 Flattop Mount Included: This model includes the TA51 flattop mount for attachment to compatible Picatinny rail systems. Confirm mount fit, eye relief, stock position, backup sight clearance, and final zero before live fire.

Important Ballistic Note: Bullet drop compensating reticles are approximations based on assumed ammunition, barrel length, muzzle velocity, sight height, atmospheric conditions, and zero distance. Always confirm actual point of impact with your chosen .300 Blackout supersonic and subsonic loads before relying on any holdover mark.

Related Gear: Browse more optics and mounts, shop Trijicon optics, view compatible RMR and red dot sights, or pair this optic with compatible centerfire rifle ammunition.