Unity Tactical Absolute Riser

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Unity Tactical FAST Absolute Riser – 2.26 inch optic height for Absolute Co-Witness optics
If an Absolute Co-Witness optic sits too low on an AR platform, the problem isn’t the optic – it’s the height. The Unity Tactical FAST Absolute Riser is a raised Picatinny-on-Picatinny riser for Absolute Co-Witness optics like EOTech XPS, Leupold LCO, and comparable rail-mounted red dot or holographic optics.
Its goal is clear: it raises Absolute Co-Witness optics to the Unity FAST height of about 2.26 inches / 5.74 cm optical axis height. This lets you work with a more upright head position, better gear compatibility, and clean height logic for FAST FTC Magnifier Mounts.


Why exactly the Unity Tactical FAST Absolute Riser? ✔ raises Absolute Co-Witness optics to about 2.26 inches / 5.74 cm optical axis height ✔ ideal for EOTech XPS, Leupold LCO, and comparable Absolute Co-Witness optics ✔ raised MIL-STD M1913 Picatinny rail for direct optic mounting ✔ approx. 23 mm / 0.900 inch height increase according to dealer/product data ✔ compatible with Unity FAST FTC Magnifier Mounts ✔ more upright head position with helmet, hearing protection, headset, face mask, or NVG setup ✔ useful for AR-15 / AR-10 / carbine setups with XPS-style optics ✔ standard rail clamp with two cross bolts ✔ compatible with optional FAST QD Lever ✔ 7075-T6 aluminum and Type III hardcoat anodized per product data
What does the FAST Absolute Riser really do?
The FAST Absolute Riser isn’t just a “normal riser.” It’s designed for optics that come factory-set at Absolute Co-Witness height. These optics sit lower than Lower 1/3 optics and therefore need more height to reach FAST height.
The classic use case is the EOTech XPS series. An XPS sits lower than an EXPS. That’s exactly why you don’t use the normal FAST Optic Riser for Lower 1/3 optics here, but the FAST Absolute Riser.


Starting point: Absolute Co-Witness rail-mounted optic

Riser function: raises by approx. 0.900 inch / approx. 23 mm

Result: approx. 2.26 inches / 5.74 cm optical axis height

Goal: more upright head position, better gear compatibility, and FAST magnifier height logic


Absolute Riser or FAST Optic Riser? ✔ FAST Absolute Riser: for Absolute Co-Witness optics like EOTech XPS ✔ FAST Optic Riser: for Lower 1/3 Co-Witness optics like EOTech EXPS ❌ Wrong riser: leads to incorrect optic height and can worsen magnifier compatibility The deciding factor isn’t the optic brand alone – but its starting height.
Co-Witness explained
Co-Witness describes how the mechanical sights and the optical axis of a red dot or holographic optic align with each other.


Absolute Co-Witness: red dot and mechanical sights lie roughly on the same line. On AR platforms, this height is about 1.4 inches / approx. 3.6 cm.

Lower 1/3 Co-Witness: the mechanical sight appears in the lower third of the optic window. This height is roughly 1.5–1.63 inches / approx. 3.8–4.1 cm depending on manufacturer.

Unity FAST 2.26 inch: significantly higher sight line. The focus is no longer on classic Co-Wi
tness, but on upright head position, gear compatibility, and FAST system logic.

Important: FAST height is no longer a classic co-witness. If you put an Absolute Co-Witness optic on the FAST Absolute Riser, you raise it to a significantly higher sight line. Mechanical standard sights then usually no longer align classically in the optic window. The purpose is not co-witness with iron sights, but a higher, more ergonomic FAST optic line.
What do 2.26 inches mean in practice?
2.26 inches correspond to about 5.74 cm of optical axis height above the rail. This height noticeably changes the cheek weld.
You have to bring your head less deep behind the weapon. Especially with helmet, hearing protection, headset, protective mask, plate carrier, or night vision environment, this can feel significantly more comfortable and faster.

Upright head position: less neck tension and less "rolling in" behind the optic

Better gear compatibility: useful with helmet, mask, hearing protection, or headset

Faster visual acquisition: the optic comes more naturally to the eye

More mechanical offset: at short distances, you have to hold higher

Conscious training needed: the height brings advantages, but only with adjusted holdover

Instructor tip: 2.26 inches changes your close range. The higher the optic sits, the greater the distance between barrel axis and sight line. At 3, 5, 7, 10, and 15 m, this can become clearly visible. Train your close-range holds consciously. Those who use FAST height but don’t know the offset will make unnecessary mistakes on small target zones.
Why the Absolute Riser makes sense on AR platforms
On AR-15 and AR-10 platforms, Absolute Co-Witness optics like the EOTech XPS sit relatively low. This can work with classic head position but often becomes uncomfortable with headgear.
The FAST Absolute Riser raises these optics to a modern higher line. This is especially relevant if you work with hearing protection, helmet, headset, protective mask, or plate carrier.

With hearing protection: less conflict between stock, ear cups, and head position

With helmet: easier view through the optic because the head is lowered less

With protective mask: raised line can significantly ease the view through the sight

With plate carrier: more upright posture can feel more natural in the cheek weld

For taller shooters: often a more comfortable cheek weld than classic low height

For dynamic drills: faster target acquisition possible if trained properly

FAST Absolute Riser or classic Absolute height? ✔ FAST Absolute Riser: better for upright head position, helmet, mask, headset, NVG environment, and dynamic setups ✔ classic Absolute height: lower, simpler, and closer to mechanical sighting ✔ Lower-1/3 optic + FAST Optic Riser: right solution if your optic already has Lower-1/3 starting height The higher mount is not an end in itself. It must fit your optic, your cheek weld, and your mission profile.
Compatibility – which optics fit?
The FAST Absolute Riser is designed for Absolute Co-Witness optics. That means: the optic itself has a lower starting height and is raised to FAST height by the riser.

EOTech XPS series: one of the most important use cases for the FAST Absolute Riser

Leupold LCO: compatible optic for this height logic according to product input

Comparable Absolute Co-Witness optics: possible if build height and Picatinny mounting base fit

Not ideal for EOTech EXPS: EXPS is already Lower-1/3 and belongs rather on the FAST Optic Riser

Important before purchase: Absolute Co-Witness and Lower-1/3 Co-Witness are not the same. The FAST Absolute Riser is intended for Absolute Co-Witness optics. If your optic already has Lower-1/3 height, the normal FAST Optic Riser is usually the more suitable solution.
FAST Absolute Riser and Unity FAST FTC Magnifier
The FAST Absolute Riser is designed for the Un
ity FAST height logic designed and can be combined with FAST FTC Magnifier Mounts.
FTC stands for "Flip To Center." The magnifier is not flipped to the side of the weapon but moved down/centered out of the line of sight. This keeps the setup slimmer than many classic flip-to-side solutions.

Optic at FAST height: e.g. EOTech XPS on FAST Absolute Riser

Magnifier on FAST FTC Mount: height logic matches the 2.26-inch optic line

Slimmer profile: magnifier does not stick out to the side

Quick switch: 1x holo/red dot or magnified view depending on position

More operating logic: magnifier, riser, and optic must be trained as a complete system

XPS + Absolute Riser or EXPS + Optic Riser?
✔ EOTech XPS + FAST Absolute Riser: sensible because XPS has an Absolute-Co-Witness exit height
✔ EOTech EXPS + FAST Optic Riser: sensible because EXPS already has Lower-1/3 exit height
❌ Do not treat XPS and EXPS the same: the exit height determines the suitable riser
This is the central point when choosing.

Our assessment
The Unity Tactical FAST Absolute Riser is a very specialized but extremely useful component if you want to bring an Absolute-Co-Witness optic into the FAST height logic.
Especially interesting for EOTech XPS users because the XPS sits lower compared to the EXPS. The Absolute Riser raises this optic to a modern 2.26-inch line, making it more compatible with helmets, masks, hearing protection, and Unity FAST FTC Magnifier Mounts.
For simple range setups without gear, magnifier, or need for a high head position, it is not necessarily required. But if you consciously plan a modern AR/carbine system, you get a very clean solution.

Suitable for:

AR-15 / AR-10 / carbine setups with Absolute-Co-Witness optics
EOTech XPS users who want to go to 2.26-inch FAST height
Setups with Unity FAST FTC Magnifier Mount
Shooters with helmet, hearing protection, headset, or protective mask
Dynamic range and tactical training setups
Users who consciously plan optic height and accessory logic

Less suitable for:

Lower-1/3 optics like EOTech EXPS – for this, the FAST Optic Riser is intended
Setups where the sight line should remain as low as possible
Classic hunting or precision builds without red dot/magnifier concept
Users who do not want to actively train close-range holdover
Optics without suitable M1913/rail-mounted base

Application scenarios

AR / carbine with EOTech XPS: bring XPS-like optics to FAST height without having to switch to another optic directly.

Red dot/holo magnifier setup: coordinate the height of the main optic on Unity FAST FTC Magnifier Mounts.

Helmet / hearing protection / protective mask: more upright head position instead of rolling deeply behind the optic.

Dynamic range: faster target acquisition when position, head position, and offset are trained.

NVG/mask environment: raised optic line can facilitate working with equipment in front of the face.

Professional setups: useful when optic height, magnifier, and usability must be reproducibly planned.

Instructor tips:
1. First check if your optic has Absolute-Co-Witness or Lower-1/3 exit height. This determines whether you need the Absolute Riser or the normal FAST Optic Riser.
2. Always check zero after mounting. Any change to optic, riser, or mount can affect point of impact.
3. Actively train close-range holdover. The 2.26-inch height noticeably changes the offset at short distances.
4. If you use a magnifier, check eye relief, FTC movement, usability, and possible collisions with backup irons, charging handle, or accessories.

Features & construction clearly explained

2.26-inch optical axis height: result in combination with suitable Absolute-Co-Witness optics. The goal is a higher, more ergonomic sight line.

0.900 inch / approx. 23 mm riser height: physical elevation of the Picatinny
nny platform, stronger than with the FAST Optic Riser for Lower-1/3 optics.

MIL-STD M1913 Picatinny: standardized interface from rail to optic.

Absolute-Co-Witness optimization: especially relevant for EOTech XPS and comparable optics.

7075-T6 aluminum: high-strength aluminum alloy for stressed mounting points.

Type III Hardcoat: hard anodized layer that reduces abrasion and protects the surface.

2 Cross-Bolt Rail Clamp: stable standard attachment on Picatinny rail.

FAST QD Lever compatible: optional QD lever can be retrofitted depending on setup.

Technical data


Product: Unity Tactical FAST Absolute Riser

Product type: elevated Picatinny optic riser for Absolute-Co-Witness optics

Product number: NT002250

Optical axis height: 2.26 inches / approx. 5.74 cm in combination with suitable Absolute-Co-Witness optics

Riser height increase: approx. 0.900 inches / approx. 23 mm

Compatible optic logic: Absolute-Co-Witness rail-mounted sights, e.g. EOTech XPS, Leupold LCO and comparable optics

Interface: MIL-STD M1913 Picatinny

Rail mount: standard rail clamp with two cross bolts

QD option: compatible with Unity FAST QD Lever

Magnifier compatibility: combinable with Unity FAST FTC Magnifier Mounts

Material: 7075-T6 aluminum

Surface: Type III Hardcoat anodized

Color options: black or Flat Dark Earth / FDE depending on variant

Price source retail: €127.00

Variants & selection


Black: discreet variant for black AR-/carbine setups.

Flat Dark Earth / FDE: suitable for FDE, Coyote, or mixed equipment lines.

Technically the function is the same. The color choice depends on your setup.

Important note on accessories and firearms law: Always check the firearms law regulations of the respective country for laser, night vision, thermal imaging, illumination, or weapon-mounted accessories. In Germany, certain weapon-mounted aiming, laser, illumination, or night vision aids are legally prohibited or highly critical. Do not mount accessories whose possession or use on the weapon is not legally clearly permitted.

Important mounting note: Always check before mounting: optic type, starting height, Picatinny fit, screws, torque, compatibility with magnifier, QD lever, operability, field of view, and point of impact. After each mounting or change to the optic system, check zero. With increased FAST height, additionally train close-range holdover.
Scope of delivery

1x Unity Tactical FAST Absolute Riser in the chosen version
Standard rail clamp with two cross bolts according to product input
Additional accessories only if explicitly included by manufacturer/dealer

FAQ

What is the Unity Tactical FAST Absolute Riser intended for?
It is intended to bring Absolute-Co-Witness optics like EOTech XPS or comparable rail-mounted optics to approx. 2.26 inches FAST height.


What is the difference to the FAST Optic Riser?
The FAST Absolute Riser is intended for Absolute-Co-Witness optics. The FAST Optic Riser is intended for Lower-1/3-Co-Witness optics like EOTech EXPS.


Does the riser fit EOTech XPS?
Yes. EOTech XPS is one of the typical use cases for the FAST Absolute Riser.


Does the riser fit EOTech EXPS?
For EOTech EXPS, the normal FAST Optic Riser is usually the more suitable choice because EXPS already has Lower-1/3 starting height.


Do I still have classic Co-Witness afterwards?
Usually no. The FAST height is significantly above classic Absolute or Lower-1/3 Co-Witness height. The focus is on upright head position, gear compatibility, and FAST system logic.


Does the riser work with Unity FAST FTC Magnifier Mounts?
Yes. The FAST Absolute Riser is designed for the Unity FAST height logic and can be combined with FAST FTC Magnifier Mounts.


Do I have to re-zero after mounting?
Yes. After every change to optic, riser, or mount you must di
e Treffpunktlage kontrolliert und das Zero bestätigt werden.

Conclusion: The Unity Tactical FAST Absolute Riser is the right solution if you want to bring Absolute Co-Witness optics like EOTech XPS to a modern 2.26-inch FAST height. It is especially strong on AR/Carbine setups with helmet, hearing protection, protective mask, or Unity FAST FTC Magnifier. The key is the right choice: XPS-style Absolute Co-Witness optics belong on the Absolute Riser, EXPS-style Lower 1/3 optics on the FAST Optic Riser.