Nightstar, production was destroyed in the Jihad, no production since.
Marauder II, the already mentioned MAD-6S, Irian.
Cerberus: MR-V2 still in production in 3145, restored just before dark age at Hun Ho. (Vaguely reference FM3145).
Gunslinger: GUN-1ERD and 2ERD in production still, Hesperus II.
Warhammer: WHM-11T, WHM-10CT, WHM-9S, WHM-9D, WHM-8M, WHM-8D, WHM-8D2, WHM-6Rb, WHM-5L and WHM-4L still in production. And even the WHM-6R in Randis.