Was it War Machine MK5 or MK7 in Avengers: Endgame?
I know there was some kind of concept for mk5 in infinity war which was scrapped , then we directly jump to mark 6 in endgame- a lot of people say that the Iron patriot mk2 is practically war machine mk5 , some say its mk7. I don't know may be I am high.
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The War Machine armor we see in IM2 and Civil War are the Mark 2 but altered.
Then he gets a new suit called the Iron Patriot.
I’m assuming the suit he has in Age of Ultron and Infinity War are then either both the “mark 4” or 4 and 5.
And then in Endgame he has a new suit which makes it the successor of that and after the building collapse on them that is the latest iteration. So that one is either the 6 or 7.

The IM3 Iron Patriot and the AoU suit are both War Machine Mk2. They're the same suit, just repainted.
Civil War suit is Mark 3
Infinity War is Mark 4
Endgame Time Heist is Mark 6
The Iron Patriot suit at the final battle after the building collapse is either Mark 5 or Mark 7.