Description

The KAC Rifle Length Free Float 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.

Rifle Requirements: 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 fore end 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.

Specifications

Weight: 16.3oz
Length: 12″

Additional Details

SKU:: KM21318
UPC:

11 Reviews

5
Fantastic Customer Service

Published by Jeremy Head on Nov 10th 2025

After looking everywhere online for a specific part, Freedom Trading was the only merchant that had it in stock and for an excellent price. Due to a small issue with the order, Freedom Trading immediately contacted me to resolve the issue. They got the issue handled very quickly and my order shipped the same day. I never purchased anything from this company before but based on this excellent experience I will certainly be doing business with them again.
5
Knight’s FFRAS

Published by Pete Montalvo on Oct 23rd 2025

Great company with quick shipping. I’ve bought from the in the past and will continue doing so.
5
Please fill in the Product KNIGHTS ARMAMENT CO FRE

Published by Kerry Redmond on Oct 15th 2025

Came in as described brand new.
5
MK!2 MOD1

Published by AMV on Oct 15th 2025

Very happy with the handguard, even happier with the service and fast shipping from freedom trading! Great company to deal with.
5
Awesome

Published by A01R on Jul 15th 2025

Been looking for this handguard for so long and this and another store had it seling for close To msrp. Id rather pay this than 200-300 more with resellers. Very happy to finally hold such a coveted piece of history. Was surprised at the speed of delivery too. Recommend this store 10/10. They doin the lords Work
5
KAC Rail

Published by Mitchel R. on Dec 3rd 2024

I’m glad I was able to snag one of these. They’re really hard to come by. They were marked up a little more than some other sites, but those sites are out of stock. $450 for a brand new FF Ras Long is pretty sweet in the current market. Overall, I am very pleased with the transaction. It was less than 2 days from ordering that I had tracking information. I will order from here again.
5
Kac ras

Published by anonymous on Dec 3rd 2024

Great product favorite quad rail for sure
5
KAC Long RAS

Published by Christian D on Dec 3rd 2024

Awesome handguard, a must have for a MK12 build. I purchased in the afternoon and had it at my door the next day! Impressive shipping from Freedom! Thank you!
5
Hard to get Knights MOD 1

Published by Ian on Sep 2nd 2024

If you are looking to build a MOD 1, sign up for the email notification and wait. It took about 6 months for me to get one, but we'll worth the wait. Excellent price for this hard to find rail, and great timely shipping. I will order again from Freedom Trading.
5
EXCELLENCE TO THE UPMOST

Published by P A on Aug 22nd 2024

First of, big shout out to Freeedom Trading Co. Their pricing, shipping, and customer service is what other companies should strive to be. Transaction for purchased item was flawless. I had item with 2 days. The item was well packaged. Will recommend to others and will conduct business here again. The KAC FF is an amazing product. Extremely looking forward to my next range day.