if it is operable in these range of conditions,then why not??
M-16 -Can't be operable in deserts where sands are like talcum powder and is prone to jamming..
Chronic jamming problems with the talcum powder like sand over there. The sand is everywhere. Jordan says you feel filthy 2 minutes after coming out of the shower. The M4 carbine version is more popular because it's lighter and shorter, but it has jamming problems also. They like the ability to mount the various optical gunsights and weapons lights on the picattiny rails, but the weapon itself is not great in a desert environment. They all hate the 5.56mm (.223) round. Poor penetration on the cinderblock structure common over there and even torso hits cant be reliably counted on to put the enemy down.
The M16 in Iraq
CZ-805-
First, pulling the bolt to the rear is only possible if the safety is off. If the safety is on, bolt will not move back. It may be from the Czech army's operation doctrine, but those of us who are used to operation of AR platforms would find it a bit odd.
The bolt lock on the left is definitely a bolt lock, not a release. Unlike AR's bolt lock, pushing it, even with the bolt locked to rear, will not release the bolt. It is not ambidextrous.
Another problem that could happen is the charging handle striking shooter's thumb. For those who like to place their support hand closer to magazine well, and stick their thumb up, it will be very apparent that it will hurt. Furthermore, the height of rifle prevents placing support hand thumb over the gun.
The last drawback I saw was the selector. It is all within 90 degrees, and with 4 modes, it only takes a small amount to go from one to the another. That means in stressful situation, there could be accidental use of 2 round burst or even full-auto burst.
Gun News Blog: GNB: CZ 805 BREN impression
every gun has some problems..its all on Army who would decide which is going to qualify and which is not..