I cannot comment on the manufacturer’s recommendations but I can tell you from an Armorer standpoint.
I would recommend field stripping it and giving it a few bore punches with a lightly oiled patch followed up by a dry patch.
Lightly oil the bolt and carrier group, not much just a dab and wipe.
Lightly oil the charging handle on the carrier key side, recessed area. Back side as well.
A few light drops of oil on the lower receiver trigger group.
Reassemble said rifle and enjoy it.