UK-SAS M4 RAS Bottom Rail Assembly


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  • Model: P/N: 20033
  • Shipping Weight: 1lbs
  • Manufactured by: Knight's Armament Company

The KAC UK-SAS M4 RAS Bottom Rail Assembly was designed at the request of a foreign military unit as a replacement for the standard M4 RIS or M4 RAS bottom rail. Unlike a standard RIS or RAS lower rail that relies upon the delta ring assembly and handguard end cap to keep it in place, the UK-SAS Bottom Rail locks onto the barrel nut via a clamp and screw arrangement, making for a much more solid and secure system. Includes a heat shield.

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This product was added to our catalog on Friday 23 October, 2009.

RESTRICTED EXPORT. The item(s) are firearm or defense related goods governed by U.S. Government International Traffic in Arms Regulations 22 CFR, ITAR Parts 120-130 and therefore require an Export License issued by the U.S. Department of State to be subsequently transported outside of the United States. These items may not be transferred, transhipped on a non-continuous voyage, or otherwise be disposed of in any other county, either in their original form or after being incorporated into other end items. The International Traffic in Arms Regulations (ITAR) is a set of United States government regulations that control the export of defense-related articles and services on the United States Munitions List. These regulations implement the provisions of the Arms Export Control Act, and are described in Title 22 (Foreign Relations),Chapter (Department of State), Sub chapter M of the Code of Federal Regulations.