I use Uxia Cover Ops as mk5 (the head comes fixed in that model, I think, and has a nice hoodie. Plus the guns look close enough to SMGs), then the Female Wu Ming HRL as Mk4, because this one has the head separated from the body (so a headswap with the 2nd head in the Chandra Specops blister is possible). Another option was to use Wildcats for the Mk4, they too come in blisters. Mk5 with Mk12 I can't rememberm and never had much interest into, since Marksmanship-X is so... meh (an X-Visor would have turned the tables) even with the Forward Deployment all MI gain this ITS (the Mk5 SMG is even better). As for the Mk4 HMG, at this moment I would have little to no doubt: grab Joan with Spitfire, and enjoy the dudette. If a new player were to ask me about what to get, I'd say: Mk1: grab an old Dactyl in blister (shame they now come in a box...). If you grab the box, well... you won't be using 2+Acmon in the ASS anyway. Mk2: Hexa Sniper (headswap) Mk3: Joan Spitfire 2018 Mk4: Wu Ming HRL headswap. Or grab a female Mobile Brigada with HRL (headswap too), or the female wildcat. Mk5: Uxia Mcneal, Covert ops blister.