The M85 was the planned replacement for the WWII era M2 .50 Caliber Machine Gun. It was lighter the the M2, shorter in size just had one little problem, no one could get it to work in combat conditions....
http://en.wikipedia.org/wiki/M85_machine_gun
http://en.wikipedia.org/wiki/M2_Browning
In other words, the M85 were dropped on the Viet Cong for the US troops did not want them, and hopefully the Viet Cong would try to use them, fire one or two shots (reveling their position) before the gun would jam (Thus little or no damage to US position). The reliability of the M85 was legendary, soldiers that had to use one did they best to trade it in for heaver, longer but reliable M2s.
Russian were not much better, Russian stocks of Grenades were numbered starting with Zero. The number represented the delay. Each box it appears to have at least one Grenade numbered Zero, i.e. pull the pin, throw the grenade releasing the safety level, it went off. It took several officers losing their hands (and getting killed) when using such grenades in San Salvador in the 1980s before they caught on that the Zero meant Zero Delay (Most grenades have a three second delay so to get away from the tosser of the Grenade and get close to the target before going off). The Russians put such grenades in every box so soldiers had access to them to use as booby traps, they were NOT intended to be thrown. On the other hand, if a box of grenades were captured, the enemy soldiers NOT trained in that the Zero meant Zero, would try to use them and do themselves harm. Such loses would also cause other soldiers with grenade from the same box NOT to use them for fears that the Grenade would blow up in their hands. Just some "tricks" of the trade.
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Just hope the defenders of that city got majority of drop.
