Arisaka Defense Offset Optic Mount MLOK
About this product
The Arisaka Defense Offset Optic Mount MLOK is a specialized mounting solution that positions a micro red dot sight at a precise 35-degree angle from the bore axis for rapid secondary aiming. This mount allows a shooter to transition instantly from a magnified primary optic to an unmagnified red dot by simply canting the rifle, a technique validated by modern close-quarters doctrine. Its fundamental purpose is to solve the problem of target engagement at varying distances without requiring the shooter to adjust a variable-power scope or manually switch between optics.
What is the Arisaka Defense Offset Optic Mount MLOK used for?
It is used to mount a secondary reflex sight, like an Aimpoint Micro or Trijicon RMR, in a consistent position for rapid close-range engagements when a rifle is equipped with a magnified primary optic. This setup is standard for modern duty and competition rifles where engagements can shift from 300+ yards to 10 yards in a single stage. The 35-degree angle is biomechanically optimized; canting the rifle naturally brings the red dot into the shooter's line of sight without breaking cheek weld or majorly disrupting the firing position, a process that takes under 0.3 seconds with practice. For more on optimizing a rifle system for different scenarios, see our guide on Precision Gas System Tuning.
How does the Arisaka Offset Mount compare to the American Defense Recon-S scope mount with an offset rail?
The Arisaka mount provides a more integrated and lightweight solution for mounting a specific micro red dot directly, while the American Defense Recon-S is a versatile primary scope mount that can accept various picatinny accessories on its side. The Arisaka is superior for a dedicated, streamlined offset red dot because it removes unnecessary picatinny rail sections, saving weight and reducing snag points. The American Defense system is better for users who need modularity and may frequently swap between different offset devices or lasers. The Arisaka mount weighs 1.9 oz, while a typical scope mount with an added picatinny rail adapter and micro mount can add over 4 oz.
What does it weigh and what are the dimensions?
The mount weighs 1.9 ounces (54 grams) and, when installed, positions the optic centerline approximately 1.65 inches offset from the primary optic's centerline. The baseplate is machined to contact three full MLOK slots for a total of 2.1 inches of direct engagement, distributing recoil forces and preventing rotational movement. The vertical height from the MLOK mounting surface to the optic mounting platform is 0.85 inches. This compact footprint is critical; it allows the mount to clear most rifle-length handguards and avoids interference with backup iron sights installed at the 12 o'clock position.
Who is this NOT for?
This mount is not for shooters who exclusively run unmagnified red dots or iron sights on their rifles, as an offset dot is redundant without a primary magnified optic. It's also a poor choice for users who require frequent, tool-less re-zeroing of their secondary optic, as the mount uses fixed, torqued screws. If your use case involves extreme cold where gloves are mandatory, the tight clearance around the optic adjustment dials on some red dots might be challenging to manipulate. Finally, it's incompatible with picatinny rail sections; it mounts directly to MLOK slots, so users of legacy rail systems should look for a picatinny offset solution.
What's in the box?
The box contains the CNC-machined 6061-T6 aluminum mount body, two MLOK fasteners (T15 Torx), two optic mounting screws (T10 Torx), and a single-page instruction sheet with explicit torque specifications. No thread-locking compound is included, which is a prudent omission, as proper vibra-tite or rocksett application depends on the specific optic and rifle system. The manual specifies 15 in-lbs for the MLOK fasteners and 18 in-lbs for the optic screws, values that are non-negotiable for maintaining zero under recoil. This reflects a no-frills, professional approach where the money is in the machining, not the packaging.
Is the Arisaka Offset Optic Mount worth it at $119?
Yes, at $119 it is worth the investment for any shooter whose rifle is a precision tool for duty, competition, or serious defense, where a fraction of a second matters. The cost is justified by its demonstrable durability—maintaining zero for over 1500 rounds of .223 in our testing—and its precision manufacturing that guarantees a repeatable 35-degree angle. Compared to a homemade solution or a less rigid mount, it eliminates a critical point of failure. For builders completing a high-performance system, this mount is a logical partner to components like the SureFire WarComp. The value is in uncompromising reliability, not features.
Specs at a glance
Video review
Pros & cons
What works
- Weighs 1.9 oz — nearly half the weight of a picatinny rail adapter solution.
- Contacts three MLOK slots (2.1") for superior torsional stability under recoil.
- Maintained zero through 1500+ rounds of .223 in controlled testing.
- 35-degree angle is biomechanically precise for instinctive rifle canting.
- Hard anodized 6061-T6 aluminum construction prevents galvanic corrosion with steel handguards.
Trade-offs
- No thread locker included — requires user-supplied Vibra-Tite or Rocksett for permanent installation.
- Fixed angle (35°) — not adjustable for shooter preference like some competitor mounts.
- Optic compatibility is limited to RMR-footprint micro dots; no built-in picatinny.
- Tight clearance may make adjusting some optic dials difficult with gloves on.
Expert review
Key attributes
| Weight | 1.9 oz |
| Material | 6061-T6 Aluminum |
| Finish | Type III Hard Anodize |
| Mounting System | MLOK (3-slot contact) |
| Optic Footprint | Trijicon RMR/Holosun 407C/507C |
| Offset Angle | 35 degrees |
| Fastener Torque (MLOK) | 15 in-lbs |
| Fastener Torque (Optic) | 18 in-lbs |
Specifications
| Weight | 1.9 oz |
| Offset Angle | 35 degrees |
| Material | 6061-T6 Aluminum |
| Mounting | MLOK |
| Finish | Type III Hard Anodize |
Best for
- Run-and-gun competitions requiring transitions between targets at varied distances
- Defensive rifles with LPVOs needing close-quarter capability
- Training drills practicing off-hand shooting positions
Materials
- 6061-T6 Aluminum
- Stainless Steel Fasteners
- Hard Anodized Finish
What's in the box
- Arisaka Offset Mount
- MLOK Hardware
- Optic Screws
Care
Frequently asked questions
- Is it compatible with a Trijicon RMR?
- Yes, it is directly compatible with the Trijicon RMR footprint (as well as the Holosun 407C/507C and similar). The optic mounting pattern uses the standard two-hole forward/rearward configuration for these micro red dots. No additional adapter plates are required, which minimizes stack height and potential zero shift.
- Does it fit on a Geissele Mk16 handguard?
- Yes, it will fit any MLOK-compatible handguard, including the Geissele Mk16, provided you have three contiguous MLOK slots available at the 1:30 or 10:30 position (for right or left-handed shooters). The baseplate is 2.1 inches long, so you must verify you have that much clear slot space where you intend to mount it.
- How long does shipping take?
- Standard processing and shipping times are 1-2 business days for in-stock items, with transit times of 3-5 business days for continental US destinations via USPS Priority or UPS Ground. Expedited options are available at checkout for 2-day or overnight delivery.
- Can I return it if it doesn't fit my setup?
- Yes, we accept returns of new, unused items in original packaging within 30 days of delivery for a full refund, less a 10% restocking fee. Mounting hardware must be uninstalled and unmarred. We strongly recommend confirming MLOK slot availability and optic compatibility before purchase to avoid this scenario.
- Does this work with an LPVO set at 1x power?
- Technically it works, but it is an inefficient setup. The offset red dot's purpose is to provide an instantly available 1x aiming solution when your primary optic is magnified (e.g., set to 4x, 6x). If your LPVO is consistently on 1x, the offset dot is redundant. The mount is designed for rifles using a dedicated magnified optic or an LPVO that is primarily used at higher magnification.
- What torque wrench do you recommend for installation?
- We recommend a high-quality, calibrated inch-pound torque wrench like the Wheeler FAT Wrench or the Fix It Sticks set. The critical specifications are 15 in-lbs for the MLOK fasteners and 18 in-lbs for the optic screws. Using a standard foot-pound wrench will likely over-torque and damage the fasteners or the aluminum mount.