A much superior weapon is the HK-91. the 93 is the 5.56 version. Both are vastly superior to the M-16, because they are fully gas operated in a way that guarantees reliability. They vent spent gases through the chamber through grooves between the casing and chamber. This forces the casing to release itself from the chamber before the gases drive the bolt rearward. This eliminates the need for an extractor. The ejector is also brilliantly engineered.
I have seen demonstrations of this weapon being dipped in mud, mixed with sand and salt water, fired, dipped again, fired, and then buried in dry desert sand and immediately fired on full auto. And it never missed a beat the whole time. (Try that with an M-16)
they need to look hard at the FN-SCAR...in 5.56 or 6.8SPC.