IDF
M4 SBR/Commando/CQBR
View attachment 462431
That's none of those models. Looks like they stripped the A1 upper on that CAR-15 Model 653, chopped the barrel, and used purchased or given M4 spare part uppers and used the with the A1 upper parts that came stripped from the A1 uppers that were on them. The teardrop forward assist is a dead giveaway, the other is the pencil barrel with A1 birdcage flash suppressor. Technical note, but m4's come with the round forward assists, not the teardrop.
Transitional M4's before they became known and officially named as the M4, was the Model 723, A1 CH upper with the A2 shell deflector, teardrop FA, and either M4 barrels or the 653 barrel.
Another interesting detail is that they all aren't issued the same Eotech model, and those pictured seemed to be hooked up from private purchases. Far left, is the only one with the PEQ. Left, has a Magpul hand stop on the left which is a strange place for it and a Troy rear BUIS. Right, has no BUIS at all and the M4 they were given all came with a Matech rear BUIS among many other things like the A2 forward round assist. Far right is carrying from what I can easily see is a stock CAR-15 with either a waffle M4 or most likely the original CAR stock (image is blurred to tell which though).
Off topic, but they have the stare going on of seeing the elephant. Prayers that they're not traumatized mentally by it in their later years.
Edit to add, those are either the Mekut'zrar or the Mekut'zar which again, were Israeli modifications to the Model 653.
Additional edit for those wanting to nerd out on the weeds of this:
https://thehebrewhammer.net/2014/11/20/idf-m16-variants-menusar/
It's incorrectly called the Menusar but a veteran from the IDF in the comments corrected this but wasn't changed to by the OP so please disregard what he's calling it.