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MUR-1A w/ Bolt Assist & Shell Deflector
The MUR is a rigid MilSpec flat-top upper receiver made to fit all AR15/M16/M4 rifles and carbines.
The MUR was developed to give the customer a MilSpec correct upper receiver with a thicker wall making the MUR upper receiver a more rigid platform. A more rigid upper receiver will increase accuracy and reliability while extending the life of interfacing components such as the bolt carrier group and barrel assembly.
The main benefit of the MUR is it's dimensionally correct. Unfortunately, with the current war effort, a number of AR suppliers are rushing through production, bypassing critical dimensions which will either make or break the reliability and accuracy of the weapon. With the existence of the MUR, you'll receive the best and highest quality upper receiver available on the market today.
The MUR comes in two models: one with a Bolt-Assist/Shell-Deflector and the second with a Shell-Deflector only. Being a modular design, Vltor offers the service of exchanging the Bolt-Assist assembly for a Shell-Deflector only assembly and vise-versa. All MURs feature a MilStd-1913 scope mounting rail and come equipped with an Ejection-Port, Dust Cover Door.
MUR at a glance:
Construction 7075 aircraft-grade aluminum forging. Prior to machining, the forging is fully stress relieved; heat treated, aged twice and undergoes a proprietary cryogenic treatment.
Compatibility Fits all AR-type lower receivers made to Milspec standards. Will fit all select-fire AR-15/M16/M4 rifles and carbines. Will fit most of the semi-auto AR-type lower receivers (currently available).
Weight MUR-1A (with assist) weighs less than 10 oz. The MUR-1S (shell deflector only) weighs less than 8 oz.
Dimensions Height of rail (from the centerline of the bore): 1.215”.
Color/Finish Black matte (anti-reflection/glare) Hard coat anodized (Type-2, Class 3). Bore’s surface in coated with dry film lube, over the anodized surface.
Special Features Improved strength over conventional forged “flat-top” upper receivers. Stronger than any “billet” upper receiver with similar material and dimensional characteristics. Tighter manufacturing tolerances, when compared to the competition.