The FAB Defense Double Picatinny Rail for M16/M4/AR15 Standard Handguard, Matte Black (FXDPRB, UPC: 7290105940278) is a lightweight, high-strength accessory upgrade that turns a basic plastic handguard into a versatile mounting platform for lights, lasers, and other Picatinny-compatible gear. Built from durable fiberglass-reinforced polymer and designed to fit standard AR-15/M16/M4 handguards, this dual rail section gives you two 45° offset rails without the cost and bulk of an entire quad-rail system.
If you want to add a weapon light, laser, or canted accessory to your rifle while keeping your existing handguard, the FAB Defense Double Picatinny Rail FXDPRB is a simple, affordable, and highly functional solution.
Designed for Standard M16/M4/AR-15 Handguards
This double Picatinny rail is purpose-built to bolt directly onto standard, round AR-15/M16/M4 handguards:
Compatible with AR-15, M4, and M16 platforms using standard polymer handguards
Ideal for military-style carbines and rifles that don’t have free-float or quad-rail systems
Lets you upgrade your rifle’s accessory capability without replacing the entire handguard
For shooters who prefer the feel and simplicity of standard handguards, this rail bridges the gap to modern accessories.
Dual 45° Offset Picatinny Rails – Perfect for Lights & Lasers
The FAB Defense DPR (Double Picatinny Rail) 16/4 gives you two 2.5" Picatinny rail sections, each mounted at a 45° angle off center.
That design offers key advantages:
Two 2.5" accessory rails for mounting weapon lights, lasers, pressure switches, or compact foregrips
45-degree offset positions accessories where your support hand and thumb naturally rest for easy activation
Keeps the top and bottom of the handguard mostly clear for your grip, bipod, or other gear
You get flexible mounting options without turning your rifle into a bulky rail monster.
Lightweight, Reinforced Polymer Construction
The FXDPRB Double Picatinny Rail is constructed from durable, fiberglass-reinforced polymer, providing an excellent balance of strength and low weight.
Fiberglass-reinforced polymer withstands hard use while keeping added weight to a minimum
Matte black finish blends cleanly with most AR-15 and M4 finishes for a factory-style look
Polymer stays comfortable to grip and doesn’t heat up as quickly as metal in rapid-fire strings
For most defensive, duty, and training use, the polymer construction offers more than enough durability while maintaining excellent rifle balance.
Simple, Secure Installation – Hardware Included
The FAB Defense Double Picatinny Rail FXDPRB is designed for hassle-free installation:
Ships with all necessary mounting hardware, so you’re ready to install right out of the package
Attaches directly to the vent holes of standard handguards with basic tools
No need to replace your handguard, change your gas block, or modify the rifle
In just a few minutes, you can add two new rail sections and dramatically expand your AR’s accessory mounting options.
Optimized Ergonomics & Accessory Positioning
The 45° rail orientation isn’t just about looks—it’s about function:
Puts weapon lights and lasers in an ergonomic, thumb-accessible position, especially with modern “C-clamp” or high-thumb grips
Keeps accessories close to the bore line and more parallel to the barrel, improving usability and sighting alignment
Allows you to leave the bottom of the handguard clear for a vertical grip, bipod, or bare-hand hold
This makes it easier to run your rifle in low light, around cover, and during fast target transitions.
Ideal for Budget Builds, Duty Carbines & Minimalist Setups
The FAB Defense Double Picatinny Rail for M16/M4/AR15 Standard Handguard, Matte Black is a great fit for:
Budget AR builds where you want modern accessories without buying an expensive rail system
Duty and patrol carbines that retain standard handguards but need a solid mounting solution for a weapon light
Minimalist or lightweight rifles where a full quad rail would add unnecessary bulk
Shooters who enjoy the traditional feel of round handguards but still want the advantages of modern accessories
If you don’t want to overhaul your entire front end just to mount a light or laser, this double rail is exactly what you’re looking for.
Key Specs – FAB Defense Double Picatinny Rail FXDPRB
From manufacturer and retailer listings:
Brand: FAB Defense
Model: Double Picatinny Rail for M16/M4/AR15 Standard Handguard
Part Number / MPN: FXDPRB
UPC: 7290105940278
Color / Finish: Matte Black
Material: Fiberglass-reinforced polymer
Rail Lengths: Two 2.5" Picatinny rails
Rail Orientation: Each rail at 45° off-center
Compatibility: AR-15 / M16 / M4 rifles with standard polymer handguards
Use: Mounting weapon lights, lasers, small grips, sling mounts, and other Picatinny-compatible accessories
Includes: Double Picatinny rail unit and required mounting hardware
(Always verify compatibility with your specific handguard pattern before installation.)
Why Choose the FAB Defense Double Picatinny Rail FXDPRB?
Select the FAB Defense Double Picatinny Rail For M16/M4/AR15 Standard Handguard Matte Black FXDPRB if you:
Want a simple, affordable way to add rails to a standard AR handguard
Need dual 45° Picatinny rails for ergonomic light/laser mounting
Prefer lightweight, reinforced polymer over heavier metal rail systems
Are upgrading a duty, home-defense, or training rifle and want a proven, easy-to-install accessory
For a small investment, you gain a major increase in flexibility, allowing your rifle to run the accessories that modern shooting demands—all while keeping the classic look and feel of your standard handguard.
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