AR-15 Monolithic Uppers
The VIS features four properly dimensioned 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 two side rails extend from the front portion of the receiver section, to the front of the VIS; and the bottom rail is attached to a removable lower section of the handguard portion. This removable lower section allows for the attachment of the M-203 grenade launcher, as well as assists in cleaning and maintenance.
The manufacturing process of the VIS is unique...starting with what is essentially a traditional separate upper receiver and handguard, these parts are partially machined then permanently joined using an exclusive welding process - this composite unit is then stress relieved, final machined and heat treated. This innovative process allows the VIS to accept any standard AR barrel! The only thing that is changed is the barrel nut used with the VIS, the required barrel nut and wrench is included with each VIS kit.
Another Vltor exclusive is the modular shell deflector and bolt assist assembly. The VIS gives the operator the opportunity to choose between a shell deflector/bolt assist combo or a shell deflector only.
While the VIS is not the first one piece upper receiver for the AR-15/M16 family, it is the first design that retains the use of standard barrels, as well as a removable bottom rail section that allows the mounting of the M-203 grenade launcher and all SOPMOD components.
Due to popular demand, Vltor also offers the unique receiver section of the VIS as a standalone Modular Upper Receiver (MUR). The MUR is a direct replacement for the MilSpec AR-15/M16 upper receiver that offers exact dimensions and tolerances, improved strength and unique modular design.
MGI QCB-D Upper Receiver
This new upper receiver is completely compatible with your M16 (small front pin) lower receiver and allows the user to change barrels in just seconds. This allows the system to be extremely compact and concealable as well as giving the operator the option of having multiple barrels for multiple functions. The best part of our QCB Upper Receiver is that it utilizes standard M16 barrels! Take a close look at the photos and you will see that the barrel is a standard M16 barrel with the Delta Ring, barrel nut, sling swivel and front handguard keeper removed. That's right, you can use standard barrels just by removing the items mentioned above! The New QCB-D model now is compatible with piston systems!!! The rails have also been changed to create less sharp edges on against the shooter's hand as well as creating cleaner lines and appearance. This is the latest revision with multiple improvements such as Hard Coat Anodized Mil Spec Finish, four full-length Picatinny style rails, new locking arm retention system and more. * BUIS (Back Up Iron Sight) and Charging handle not included with upper receiver.
Advanced upper receiver design features a Quick-Change-Barrel (QCB) system that permits rapid teardown of your AR-15 rifle or carbine into three, basic components (barrel, upper and lower assemblies) for fast storage in carryalls as small as a briefcase. At 15-inches overall length, this receiver/handguard combo is the perfect choice for MIL/LE personnel seeking maximum weapon concealment and portability in a compact, small arms package, plus the versatility to interchange barrels of varying length, contour, and twist rate for missions ranging from CQB to long-range sniper operations. Completely compatible with conventional, lower receivers having a small (.250") diameter front pivot pin. Ported, aluminum free-float tube features four, 6" long fixed rails, and includes a self-contained, steel barrel retainer, spring-loaded release levers and retaining block for solid barrel attachment. Accepts all standard weight, government profile barrels, and most heavy contours up to .980" diameter. Semi-stripped, A-3 flattop receiver includes forward assist and dust cover.