Description
Centurion Arms
MK11 Mod 0 SR-25 13.5” Free Float Quad Rail
The Centurion Arms Rifle-Length Free Float Quad Rail is a premium AR-10 handguard engineered for accuracy, versatility, and functionality. Modeled after the original Knight’s Armament SR-25 MK11 Mod 0 FF RAS design, this rail system features full-length MIL-STD-1913 Picatinny rails at 12, 3, 6, and 9 o’clock for unlimited mounting options in a 13.5 inch length that will cover the gas block on a rifle length gas system barrel. The standard MK11 Mod 0 length rails can be found here
Key Features
- True Free-Float Design – No barrel contact for improved accuracy and consistent point of impact.
- Full-Length Picatinny Rails – Continuous MIL-STD-1913 top rail and quad-rail configuration for optics, lasers, grips, and lights.
- 13.5” Rail – This extended version of the Centurion MK11 Mod 0 Rail will cover the gas block on a rifle length gas system.
- Rifle-Length Gas System – Designed specifically for AR-10–style rifles with rifle-length gas systems.
- Durable Construction – Built to military specifications for long-term performance.
Installation Requirements
This is not a drop-in rail. Installation requires:
- Rifle-length gas system (recommended) – this can be installed with a shorter gas system barrel but requires a low profile gas block
- Standard AR-10 armorer’s barrel nut wrench (sold separately)
- Strap wrench (sold separately)
- Includes all essential mounting hardware.
What’s Included
1x Centurion MK11 MOD 0 SR25 13.5” Quad Rail Handguard
1x Proprietary Barrel Nut
3x Precision Alignment Pins
1x Specialized Rail Nut
Specifications
- Length: 13.5” with Rail Nut
- Weight: 18.4 oz
- ID: 1.42”
- Made in the USA
Installation Instructions can be found here
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