I just wanted to elaborate, hehe. I know all too well most people have the original - here, in IDF, there are 2 assault rifles used, in 5 modifications:
IMI Galil SAR - used by armored corps, artillery corps.
IMI Galil AR - only seen it used by artillery corps guys during boot camp, combat guys, as well as armored corpse people doing boot camp used the carbine version (SAR).
M16A1 - the basic american version, used mostly in boot camps and by non-combat people.
M16A2 - in the case of Israeli army, it does not mean an M16A1 with 3-round burst trigger group and modified rear sight - it means an Israeli-assembled combination of M16A1 upper reciever (with or without case deflector), M16A1 lower reciever, a 14.5" barrel with 1:12 rifling twist (which seems incredibly dumb, as we use M855 ammo in Negev LMG, while the M16s are only capable of firing M196 ammo, destroying the interchangeability...), and M16A2 muzzle flash dispenser (the "birdcage" type), and an XM177/M4/Commando telescopic stock. Also, a reflex sight (such as Elbit Falcon) is often used.
M16A3 - same thing as "Israeli M16A2", but equipped with a cheek piece, bipod, and a scope (3 or 4 different day scopes used in IDF, don't remember their names offhand).
And, despite the fact that automatic fire is almost never used in IDF for reasons of conserving ammunition (in many units, it is forbidden to use automatic fire), all rifles are equipped with the full-auto trigger group, instead of the M16A2 3-round burst one...