1. XM106(aka Colt Automatic Rifle) epik failed with competition with M249 because of its lack of firepower. Army didn't like Rifle-based light machine gun from the beginning (it goes back to M14E2, which was light automatic rifle version of M14, which also failed from the competition with M60)
2. Closed bolt position for automatic rifle will cause overheating with 2 or 3 C-Mag. TBH, automatic weapons that designed to have heavy firepower, they need to have open bolt buy any means. Closed bolt is ideal for accuracy with rifles, but not with machine guns
3. M27 is going to fail. That's for the sure. Although people still complains about M249, it is still the best choice that army can make(i know Mk.48 and this is about special forces, but still everything goes back to M249 design)
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