Cobb MCR-100

An entrant into the SCAR contest, the Cobb MCR-100 looks to be a very good example of the AR family, the main advantage being that it can be chambered not only in the usual run of calibres-5.56mm, 9mm, .45ACP, 6.5 Grendel and .50 Beowulf- but it can also take 7.62x39mm (an M47?). That's a fairly versatile platform for any shooter.