To be honest,I think the 762x54 PK is more correctly refered to as a "medium machine gun" than a "light machine gun".
And, of course, it's the experienced fighters and NCOs who gravitate to the longer-range more specialized weapons, which require more than a rookies attention and for whom an AK is a better and simpler item of issue- particularly for those nighttime situations. It's a good bet that that snakeeater advisor helping those guys by pointing the air support the right way is a heavy weapons NCO....
I seem to recall T.E. Lawrence making the point that it is better that they should do a thing imperfectly, than that you should do it for them perfectly... But directing close air support can be partricularly costly if done inexpertly, even if the locals are fast learners.
You reckon those folks are using the killdots against the bad guys?
-archy-/-