If you have been following optic trends over the past few years, you have likely come across two terms that cause plenty of confusion in online forums and gear shops: the Aimpoint COA and the A-cut footprint.
Engineered as a dedicated interface for factory-milled slides—most famously debuting on the Glock Gen 5 A-cut—the Aimpoint COA was built to give shooters an enclosed, ultra-rugged red dot with a direct-mount, low-profile fit.
However, once Aimpoint released the standalone COA red dot to the commercial market, carbine and sub-gun shooters immediately ran into a wall. You had a high-performance, weather-sealed Aimpoint optic in your hands, but no way to mount an A-cut footprint to a standard 1913 Picatinny rail.
This guide breaks down everything you need to know about the A-cut interface, why standard Acro plates won’t fit a COA, and how the KDG BOM COA Mount bridges the gap to bring this optic to your rifle setup.
WHAT IS THE AIMPOINT A-CUT FOOTPRINT?
To understand why mounting a COA on a rifle required a totally new engineering approach, you have to understand how the A-cut differs from other industry footprints.
The A-cut is a proprietary mounting standard developed specifically for the Aimpoint COA optic. Unlike the Aimpoint Micro (T2) footprint that uses bottom-threaded screws or the Aimpoint Acro footprint that uses a wider transverse cross-clamp, the A-cut features a unique, streamlined profile engineered for direct slide integration.
Why Shooters Love the Aimpoint COA
- Enclosed Emitter Design: Keeps mud, rain, snow, and lint from obstructing the laser diode.
- Low-Profile Architecture: Sits lower to the bore axis than traditional enclosed optics.
- Aimpoint Reliability: Proven thermal stability, legendary battery efficiency, and clear glass.
The optic itself is outstanding. The problem was never the glass—it was the complete lack of mounting versatility outside of a pistol slide.
THE COA MOUNTING DILEMMA: CAN YOU PUT AN A-CUT OPTIC ON A RIFLE?
Until recently, if you bought an Aimpoint COA, you were forced to run it on an A-cut pistol slide or leave it sitting in your gear safe.
We don’t follow the market; we build what it’s missing. We engineered a dedicated, direct-to-Picatinny hard mount designed specifically for the A-cut / COA interface.
UNLOCKING THE COA ON CARBINES: THE KDG BOM COA MOUNT
As one of the very first manufacturers to release a dedicated A-cut Picatinny mount, we designed the KDG BOM COA Mount to solve the mounting deficit completely.
Instead of fighting with adapter plates, the BOM COA Mount gives your Aimpoint COA a direct, precision-machined interface that bolts directly to any standard 1913 Picatinny top rail.
[PRODUCT SPECIFICATION DATA]
PRODUCT: KDG BOM COA MOUNT
SKU: BOM-MK1-130
FOOTPRINT COMPATIBILITY: AIMPOINT COA / A-CUT
INTERFACE: 1913 PICATINNY HARD MOUNT
CONFIGURABLE HEIGHTS: 1.57" (BASE) / 1.93" (WITH LIFT BLOCK)
BASE MATERIAL: LIGHTWEIGHT ALUMINUM
CLAMP MATERIAL: HIGH-STRENGTH STEEL
WHY THE BOM COA MOUNT LEADS THE MARKET
1. Dual Heights Included in One Box
Mounting a pistol-milled red dot to a rifle rail means you need proper height elevation. The BOM COA Mount ships with two complete height configurations:
- 1.57″ Lower-Third Co-Witness: The standard baseline height. Delivers a natural cheek weld while allowing backup iron sights to align inside the lower third of your sight picture.
- 1.93″ Heads-Up Height: Use the included precision aluminum lift block and long screw kit. This raises your COA for a comfortable, upright posture, passive aiming through night vision goggles, or gas mask clearance.
2. Hybrid Construction for Maximum Lockup
Transitioning a COA optic from a slide to a rifle means preparing it for hard abuse. The BOM chassis uses a lightweight aluminum main body to keep your upper rail agile, paired with a high-strength steel side clamp and crossbolt. When torqued down, it creates a vice-like grip on your Picatinny rail that will not shift zero under severe shock or heavy recoil.
3. Modular Top-Plate Architecture
Even though you are mounting an A-cut optic today, your mounting system isn’t locked into one ecosystem forever. If you ever decide to swap glass in the future, you retain the base, steel clamp, and riser block—simply unbolt the COA top plate and swap it for a T2, RMR, or ACRO plate.
GAIN THE ADVANTAGE
Don’t let a unique footprint limit where you run world-class glass. The KDG BOM COA Mount breaks the Aimpoint COA out of the handgun enclosure and turns it into a high-performance primary optic for your carbine, shotgun, or sub-gun.
Equip your setup with the definitive A-cut mounting solution, lock in your zero, and gain the advantage.
