MR C

The Modular Rifle - Caseless (MR-C), is a mock-up of an assault rifle that was intended to be manufactured and sold to the United States military as a next-generation infantry weapon firing next-generation ammunition. It has not been developed—even in prototype form—and the weapon was never lined-up for the OICW competition or in follow-up rifle competitions held by the U.S. military. On the Crye Associates website, the product is specifically labeled as a "modular caseless carbine mock-up". Most information circulating on the rifle is derived from the video game Tom Clancy's Ghost Recon: Advanced Warfighter, and should not be taken as fact.

Designed by Crye Associates, the concept is shown to utilize a bullpup design with an all-sides rail interface system. By most accounts the real world version would be chambered for 6.8mm caliber in 45- or 50-round magazines, unlike its video game counterpart that is chambered in 5mm, 4.6×30mm, and 5.56×25mm according to Tom Clancy's Ghost Recon: Advanced Warfighter and Tom Clancy's Ghost Recon Advanced Warfighter 2. The rifle is projected to have a cyclic rate of 800 rounds per minute. It is also shown to have a special 40 mm grenade launcher attachment known as the AGL. The AGL in the game, however, is a modified version of the real world Enhanced Grenade Launcher Module designed for the FN SCAR rifles. In most of the pictures, the gun is seen painted in Crye Precision's Multicam pattern. It also appears in the Steam Workshop modpack called "The MR-C" and "The Domination Pack" which are both modpacks for Unturned. It's description is "6.8mm caliber caseless bullpup assault rifle mockup"