yes the original IMI ( Israeli military industries) isnt in business anymore. it was a state owned business. it was reformed as a private company as IMI systems . it's now owned by Elbit systems. when it was IMI they made some of the finest ammo and weapons. honestly cant tell you how their quality rates now as I have nothing from them that I can think of.
Not sure what you mean. From what I have read, Sampson industries either imports or makes some ammo for IMI Systems and formerly IMI. They have for a long time.
In 556, the green/yellow (bottom box picture) and white box ammo labeled IMI systems is sold currently. It comes and goes in scarcity, but just now can be had at a decent price of ~30-33 cents/round for M193. The bottom picture is the current branding.
From what I can tell, IMI Systems mostly sells 556 and 9mm. The other calibers (308 and 338) are more scarce in the US. The blue box 308 stuff might simply be old surplus still being imported/sold. But the green/yellow box (bottom) is the current branding, so it'll probably show up again eventually.
I dont think that the green/yellow has been discontinued. I think that is the current branding. My experience (with the 556) is that scarcity comes and goes. places get a bunch of it, then it sells out quickly. I have a lot of the 556 (green/yellow box) I bought on sale, and its pretty good stuff.