After some requests for size comparisons on the MaxMini from Dakka and in the comments, I’ve taken some quick photos to help people judge which heads are right and wrong for their own purposes. I’ve also got an older review – of the Steam Knight helmets. Though I only used Marine bodies on that one, as you can see in that post, they’re on the smaller side, and so I think they’d work on smaller like the below Mantic/McVey models as well.
From left-right, we have a Sedition Wars female, a “marine” made of a Maxmini head, GW torso and Anvil Industries legs. A sci-fi Bombshell Babe. She’s about the height of a marine, but less bulky – A good representative for many of Reaper’s sci-fi figures. Next is A Mantic Enforcer, Mantic Corporation with actual head, Sedition Wars male, and another Mantic Corporation fig with Maxmini “Biohazard” diving bell. Last up, we have a completed GW Space Marine.
So. Opinion time. The gladiator helmets are a little small for marines, but workable. They’re also suitable for the McVay and Mantic figures, as actual gladiator helmets are pretty damned big.
The Black Lotus helmets are perfect for marines, but a bit big for the truescale figures – unless you want big ancients helmets for them.
The “Immortals” Egyptian helmets would work on the McVey/Mantic bodies. They might seem a touch big, but then there’s a lot of bling on them, so if you disregard all of the spikes and so forth which make them look bigger, they work. Similarly, they work on marines, but may look a touch smallish.
The Mecha-Egyptian helmets (V.1) look perfect for marines, but a bit big to go with the truescale figures. Similarly, the Biohazard heads are perfect for marines but too big for the truescales. A possible exception for the “diving bell” helmet, since diving bells IRL are huge, so with a trim to the neck they could work with truescale figure – depending on what you’re trying to do.
The Hybrid heads are a good fit for truescale figures – bear in mind that they are deliberately bulbous, though. They seem a little small for marines.
Once again, I hope this is helpful. I realise it might be a touch mroe useful if I clipped off a bunch of the heads and blu-tacked them to a Mantic and GW torso, but I don’t want to cut up the sprues at this stage, since it makes the heads easier to lose. (yeah, after moving house, I need to find those Steam Knight helmets I linked earlier..!)