MC2R

The Multi-Caliber Combat Rifle, or simply the MC2R is an AcDragonian produced combat rifle for the AcDragonian armed forces as a direct replacement of the M8A1. Developed by Cerberus Armaments, this weapon is one of AcDragonia's first true home grown weapons that isn't relying on weapon schematics either from Terran antiquity, other nations in the protectorate or a modification there of. As such, the MC2R is just as much a reflection of the AcDragonian Armed Forces as is a doctrine paper.
The MC2R is built from the ground up to be a do-it-all rifle. The design philosophy with this rifle was to replace as many AcDragonian weapons as possible with one easy to use and understand weapon system. This allows for the individual soldier, in execution of the AcDragonian battle doctrine of extreme flexibility, to be able to cover any role necessary at a whim. The rifle comes with a large selection of barrels ranging from 9.5" up to 20" depending on the role that needed. Likewise the weapon also comes in a variety of calibers, which is what gave the rifle it's name. The 5.56x45 and the 7.62x35 rounds use the same box magazine while the 6.8x51mm and the 7.62x51mm rounds use the same, but large box magazine. The MC2RA1 is the smaller caliber variant while the MC2RA2 is the larger caliber variant. Outside of that difference, the weapons are virtually identical in both engineering and functionality.
The barrels can be swapped without using tools by locking the bolt back and then disengaging a detent pin, lastly rotating the barrel will disconnect it. The bolt in the gun uses technology that was picked up from the Hive which allows the bolt face to adjust it's size. This adjustable bolt can be used for both the A1 and A2 variants, meaning less parts. The rifle is in active development still and the current focus is trying to find a way to make the magazine well modular so that it can be swapped out to allow for the use of one uniform lower receiver but giving it the ability to change to between larger and smaller rounds simply by popping out the magazine well and replacing it with another module.