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.

VIS Receiver System Frequently Asked Questions

Can I fit the gas block or a suppressor inside the VIS handguard section? 
Only a “low-profile” gas block will fit. There are no railed gas blocks or suppressors that will fit.

Does the VIS accept standard AR15-type barrel assemblies? 
The VISåäÌÝ̦uses standard AR15/M16 barrels with a modified barrel nut (included).