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One of Vltor’s most innovative products is the Versatile Interface Structure (VIS) upper receiver assembly. The VIS is a polylithic upper receiver assembly that ties the normally individual receiver and handguard into a single, aggregate part. This combination overcomes many problems that are associated with the traditional “two piece” design; most notably the greatly improved structural strength and repeatable accuracy. This affords the user all the benefits of a free-floating barrel and rock-solid railed forend.
The VIS features four Mil-Std-1913 Picatinny rails: The top rail is one continuous rail, from the back of the receiver section to the front of the VIS. The removable lower section allows for the attachment of the M-203 grenade launcher, as well as assists in cleaning and maintenance.
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