there are ton's of variables in this.
1)weapon heat
2)carbon buildup
3)magazine failures
4)dirt
5)sweat
6)heavy weapons IE not the POS 249 SAW (Shit and Worthless)
I can't count the number of times magazines have been a problem firing from an A4 much less the M4's I fired. the tension in the spring wouldn't be enough to feed the following round into the chamber properly.
Heat, hasn't been an issue until about round 200+ (solution: piss on the barrel or pour water on it works for everything else but smells aweful)
When the carbon from the powder decides it wants to stick in all the wrong places at the wrong time the only solution is more lube (as with other things
). Sadly your not thinking about that when bullets are turning your hiding spot into swiss cheese, nor do you have time.
Sweat+dirt=mud...never been a good thing for any weapon. (save for the AK47)
My biggest issue is...who the hell sent them into a hostile situation with a SAW as their Support weapon, that is just a bullshit move. A 240 is a must when in terrian like that. It is a PITA to carry, But it could've saved lives. A properly set up gun team can have their weapon in place locked and loaded on target in SECONDS, and allow the fire to be drawn to them so the light infantry can advance and repel the enemy. Ideally you want 2 -3 gun teams per group you send out so that the enemey can NEVER know you are coming. talking guns will enable the Fire teams to shoot and scoot towards the enemy, and allow for continuous fire on a designated position.