The MUR is a rigid Mil-Spec flat-top upper made to fit all AR15/M16 M4 rifles and carbines. The MUR was developed to give the customer a Mil-Spec 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. The MUR-1A model comes equipped with a shell deflector and forward assist. The MUR-1S comes with a one-piece machined shell deflector only.
NoteDue to VLTOR’s Lifetime Warranty, they advise that you do not remove or attempt to remove your shell deflector. The shell deflector is pinned in place during factory assembly. VLTOR's Lifetime Warranty covers all of their products as long as they are not modified in any way (i.e. disassembly).