Debaser, what I meant about operated differently was how a user was meant to apply its capabilities. The M-4's Gas port takes in gas at higher pressure than an M-16 does (a competition AR-15 shooter told me this) due to the length of barrel. That would be about the only appreciable reason that I could think of that the talk about reduced reliability even with good maintenace becomes a concern. The key difference between the M-4 and the AK is that foreign contractors who have bought units of the 108 model have had 18" barrels installed. Well above the general fragmentation profile, as well as retaining fine accuracy. Closed bolt, well-machined rifles in general achieve at least decent accuracy in the hands of your average shooter.
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