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AR15 5.56 Free Float RAS Mk12 Mod 1

AR15 5.56 Free Float RAS Mk12 Mod 1

Knights Armament · Rails & Handguards

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Best price

$401.99at Brownells

In stock checked Oct 1, 2026

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StorePriceAvailabilityBuyAdd to build
Brownells Best price $401.99checked Oct 1, 2026 In stock Buy at Brownells
MidwayUSA $402.99checked Oct 1, 2026 Out of stock Buy at MidwayUSA
OpticsPlanet $439.99Salechecked Oct 1, 2026 Out of stock Buy at OpticsPlanet

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Price history

Lowest in-stock price in the last 30 days: $401.99 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table
StoreLatestLowestHighest
Brownells$401.99$401.99$401.99
MidwayUSA$402.99$402.99$402.99
OpticsPlanet$439.99$439.99$439.99

Since Sep 27, 2026.

About this part

The AR15 5.56 Free Float RAS Mk12 Mod 1 is an AR-15 handguard from Knights Armament. It's sold by 3 stores (1 in stock), from $401.99 to $439.99. The lowest in-stock price in the last 30 days was $401.99 at Brownells.

Specifications

Manufacturer
Knights Armament
Platform
AR-15
Caliber
5.56 mm NATO

From the manufacturer

The KAC Free Float Rifle RAS has been in service with a variety of military units, proving itself as one of the most versatile and rugged handguards available.  The RAS (Rail Adapter System) features full length mil-spec M1913 Picatinny rails at the 12-, 3-, 6-, and 9 o’clock positions, making it compatible with any number of rail-mounted tactical accessories. The rail free floats the barrel, allowing for consistent barrel harmonics upon firing, and thus increased accuracy potential. Includes three KAC 11 Rib Rail Panels.

This Free Float RAS requires that the rifle have a carbine or mid length gas system and a low profile gas block. Disassembly of the rifle’s gas system and removal of the factory barrel nut will be necessary. This forend uses a proprietary barrel nut that may be installed using a standard AR-15 armorer’s barrel nut wrench (sold separately). For AR-15/SR-15 based platforms only; not compatible with SR-25 variants. Installation instructions are included.


Big Book Catalog, Issue:70, Page:051

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$401.99 at Brownells
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