Knights Armament AR15 5.56 Free Float Ras MK12 Mod 1
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Knights Armament
Overview
The Knights Armament AR-15 5.56 Free Float RAS Mk12 Mod 1 handguard is designed for serious builders looking to enhance accuracy and flexibility on their AR-15 platform. With a 12-inch free-float design, it minimizes barrel heat distortion and allows for better precision, while the Picatinny mounting interface provides ample space for accessories and optics. This handguard is commonly found in builds featuring a carbine gas system and chambered in 5.56 NATO, making it a solid choice for tactical and precision applications.
Specifications
August 2026 on GunPartPicker
Knights Armament AR15 5.56 Free Float Ras MK12 Mod 1 ranked #86 of the 243 handguards builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #123 of the 635 handguards builders have added. Builds with this handguard are nearly all chambered in 5.56 NATO, split between carbine-length (50%) and mid-length (50%) gas systems, and mostly AR-15 (67%, then AR-9 33%).
It was hard to find in August 2026, in stock on only 2 of the 11 days we checked, and today only Brownells has it in stock. The best price crept up from $359.99 to $401.99 over August 2026. Buying today, the lowest price is $401.99 at Brownells, above August's low of $359.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Frequently Built With
The part most often added in each category by the 12 builds that include this one
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Daniel Defense 14.5" 5.56 NATO CHF Mid-Length 1:7 Government Contour AR-15 Barrel With Gas Block
Foxtrot Mike Products Complete FM9 Premium 9mm AR-15 Lower Receiver
Bravo Company M16 Bolt Carrier Group Black
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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