Product Description
The Annex Defense M-LOK ARCA Rail lineup provides a complete solution for mounting your rifle to a tripod or support system using the ARCA-Swiss interface.
Designed for hunters and precision shooters, these rails allow you to convert any M-LOK handguard or compatible platform into a stable, repeatable mounting surface.
Built with a focus on weight savings, durability, and real-world usability, Annex Defense offers multiple sizes and configurations to match any rifle setup—from full-length precision rigs to lightweight hunting builds.
All options are compatible with standard ARCA-Swiss tripod clamps and ball heads, making them a versatile upgrade across a wide range of systems.
Key Features
- Full ARCA-Swiss compatibility
- M-LOK mounting interface
- Lightweight, skeletonized designs
- Low-profile fit for improved ergonomics
- Secure lockup for tripod and support use
- Multiple sizes to match different rifle setups
- Made in the USA
Options Breakdown
XL Rail (11.25")
Maximum Stability and Mounting Surface
The XL Rail is the longest option in the lineup, providing the most surface area for tripod mounting and positional shooting.
Key Details
- Length: 11.25"
- Weight: 4.12 oz
- Ideal for precision rifles and long-range setups
- Provides extended mounting range for tripod positioning
- Flat surface works well for barricade or bag use
Short Rail (3.11")
Balanced Size for Versatile Setups
The Short Rail offers a great balance between size and usability, giving you enough mounting surface without taking up excessive space.
Key Details
- Length: 3.11"
- Weight: 1.3 oz
- Great for thermal rigs and general hunting rifles
- Provides a stable mounting point with minimal added weight
Square Mount (Single Slot)
Compact, Low-Profile ARCA Interface
The Square Mount is a minimalist option designed to occupy a single M-LOK slot while still providing full ARCA functionality.
Key Details
- Weight: 0.52 oz
- Requires one M-LOK slot
- ARCA interface on all four sides
- Extremely compact and comfortable to handle
- Ideal for tight setups where space is limited
Sidekick Rail (Single Slot)
Minimal Footprint, Maximum Efficiency
The Sidekick Rail is designed to give you ARCA capability with the least amount of bulk possible.
Key Details
- Weight: 0.25 oz
- Requires one M-LOK slot
- Narrow, low-profile design
- Maintains strong tripod interface while reducing handguard obstruction
- Ideal for lightweight hunting builds
Use Case
- Tripod shooting setups
- Predator hunting rifles
- Thermal and night hunting rigs
- Precision rifle platforms
- Lightweight backcountry hunting setups
Notes from Ally Munitions
This is the full family of M-LOK ARCA rails from Annex Defense that we recommend to our customers.
Annex Defense is a top-notch manufacturer based in the USA, and these rails represent our favorite ARCA solutionacross a wide range of builds.
While we do offer other ARCA options, these are the ones we keep coming back to. There is a solution here for just about every system.
If you are searching for Q-Sert, please refer to our Q Fix upgrades listing. If you need a tripod or ball head, we offer those as well.
Now let’s break it down:
- The XL Rail is our preferred option for precision rigs where maximum mounting surface is needed. If you want full adjustability and a large flat interface for tripod or barricade use, this is the way to go.
- The Short Rail is a great all-around option, especially for thermal and hunting setups where you want a little more mounting surface without committing to a full-length rail.
- The Square Mount offers similar functionality in a more compact form. It’s a solid choice for tighter setups where space is limited but you still want ARCA capability.
- The Sidekick is our favorite for most hunting rifles—bolt guns and ARs alike. It gives you ARCA functionality without taking up unnecessary space on your handguard or stock. If weight and simplicity are priorities, this is the one.
