In the image below are the miniatures bits for a squad of ten space marines in Mark IV armour taken from the Betrayal at Calth board game. I hope this (cut sprue) image will be of use to people looking for bits of their own.
Some of the things that stand out to me are (in no particular order):
The multi-part missile launcher and heavy bolter;
Two bare-heads (one clean shaven which will look good for Alpha Legion players; the other with an ocular implant; others with studs);
Front torso for a commander;
Different legs many of which with "Heresy" era studs;
Four shoulder pads with Heresy era studs on;
and all important specialist guns! (pity I need several more of these for a support squad really!).