Like all CASV systems, the CASV-M relies on "piggy-back" mounting to the top of a “flat-top” M4 or M16A4 upper receiver. This chassis features a removable lower handguard, which allows the access of an M203 grenade launcher. The smooth body construction allows multiple rail mounting points, adaptable to any mission needs. Each CASV kit features various length removable rails and mounting hardware.

The CASV-M is the same as the CASV-EL, but with an enclosed top-end (not cut for a Carbine Length Gas System/Fixed Sight Tower). The CASV-M is intended to be a “drop-on” rail system for a “mid-length” gas system which is equipped with a fixed sight-tower/gas block system. The CASV-M can fit over a carbine length gas system, as long as a “low-profile” gas block is installed.

Like all CASVs, the CASV-M relies on the use of on the Delta Ring for a more secure mounting point. Vltor does not recommend the CASV-EL, CASV-M or CASV-S to be used without the standard Delta Ring assembly.

This CASV chassis is made entirely of aluminum with exception to the stainless steel mounting hardware. After mounted, the CASV-M adds less than 1lb (14.3 oz /384g, without mounted rail sections) to the firearm's overall weight. Like the CASV-EL, the CASV-M is offered in the following colors: Black, OD Green and Flat Dark Earth (tan). 

**Optional product: CASV-M Flip-up Front Sight (part # CAS-FS). When using a low-profile gas block or a gas block without iron sights, the CASV-M will accept a specially designed flip-up front iron sight that mounts to the upper forward portion of the CASV-M chassis. This is ideal for any short barrel and/or short gas system. This front sight system comes with all mounting hardware and retails for $69.95.

Installation note: The installation of this CASV Chassis does not require any modifications to the firearm, unless the installer intends to mount the CASV-M on an upper receiver group featuring a Carbine Length (or shorter) gas system. In that case, a low-profile gas system must be used to fit properly underneath this CASV chassis system.

All CASV-M kits contain the following Items:
Qty.1    6-inch Accessory Rail
Qty.2    4-inch Accessory Rail
Qty.2    2-inch Accessory Rail
Qty 1     2-inch Accessory/Adapter Rail (made to fill the void in front of the top rail).
Qty.13   10-32 x ½ Flathead Hex Drive Screw
Qty.2    Hex Wrenches for Mounting Clamp and Accessory Rail Installation.