[Pats]

ok, you got me there. I didn't know the 540 version.
But the Issue is, the Picture LBM 25087 shows the 550 and is used by several units (e.g. Unit 377)
So that brings up the Question what else is "not so right".
What I could imagine; the original designer of the oob might been right using only 510 and 540 versions (but both then with not the exact pictures) for the Chilean army. As far I can tell they using today (or in close future; Chile ordered them, but it could be only for special forces) the 550 version as well (!) LBM 25087.
So, Units 340, 341, 342 could have the 540 version and the later Units could effectively having the 550.

Just a suggestion.

Any hint which LBM might be the 540?
(Maybe LBM 36240?)