Knights Armament AR15 5.56 Free Float Ras MK12 Mod 1
Click to see full view
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
October 2026 on GunPartPicker
Knights Armament AR15 5.56 Free Float Ras MK12 Mod 1 ranked #98 of the 290 handguards builders added on GunPartPicker in October 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #111 of the 793 handguards builders have added. Builds with this handguard are mostly chambered in 5.56 NATO (79%, then .223 Wylde 14%), split between carbine-length (38%) and mid-length (38%) gas systems, and mostly AR-15 (87%).
Availability is good: it was in stock at one retailer or another nearly every day in October 2026, but today only Brownells has it in stock. Prices barely moved in October 2026, holding around $401.99, so there haven't been real sales lately. Buying today, the lowest price is $401.99 at Brownells, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which handguard to pick?
We ranked every handguard by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Handguard Trends →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Bravo Company M16 Bolt Carrier Group Black
Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Daniel Defense 14.5" 5.56 NATO CHF Mid-Length 1:7 Government Contour AR-15 Barrel With Gas Block
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.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
No reviews yet. Be the first to review this product!