MUR (Modular Upper Reciever)

[Products] [Handguards and Rail Systems]
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The Modular Upper Receiver (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 stronger platform. This more rigid upper receiver will increase accuracy and reliability, while extending the life of the interfacing components, such as the bolt carrier group and barrel assembly.

MUR-1A (with bolt assist) showing the right side. Mounted to the MUR-1A is a CASV-S rail/handguard system.

The MUR comes in two models: one with Bolt-Assist/Shell-Deflector (part# MUR-1A) and the second with Shell Deflector only (part# MUR-1S). Vltor offers the selection at the time of purchase, but does not offer a service to exchange the Bolt Assist or Shell Deflector. 

The MUR is made from a 7075 aircraft-grade aluminum forging. Prior to machining, the forging is fully stress relieved, heat treated, aged twice and undergoes a proprietary cryogenic treatment. The MUR is precision machined and each part finished by hand. There is not a better upper receiver available.

The main benefit of the MUR is that it is dimensionally correct. Vltor ensures the reliability and accuracy of our production process by using precision machining equipment, thorough quality control inspections, and a 100% final check of all critical dimensions. When you own a Vltor MUR, you have the highest quality upper receiver available on the market today.

All MURs feature a MilStd-1913 scope mounting rail and come equipped with an Ejection-Port, Dust Cover Door.

Installation note: The installation and the assembly on the MUR should be performed by a qualified gunsmith and/or certified armorer.

MUR - Images

MUR-1, Left side	MUR-1A (with bolt assist) is shown to the left and the MUR-1S (deflector only) to the right.	MUR-1A (with bolt assist) is shown to the right and the MUR-1S (deflector only) to the left.
MUR-1A (with bolt assist) showing the right side. Standard AR15 Bolt-Assist and Ejection Port Cover door are used on the MUR-1A.	MUR-1A (with bolt assist) showing the right side. Mounted to the MUR-1A is a CASV-S rail/handguard system.	MUR-1s (deflector only) showing the right side. Standard AR15 Ejection Port Cover door are used on the MUR-1S.

	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-III, Class 2). 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.