Just converted up some Tank Hunters from a pair of old, badly painted Sentinels I had knocking around. They're sitting downstairs with their undercoat drying at the moment, but here's the shots of them with the weapons finished and glued on.
The weapons in question are Dominator-class Heavy Antimateriel Cannon (counts as Lascannon); just gives a little bit of visual difference to the pair of them. The weapons have an automatic breech ejection system round the back, as well as the old Bren-gun style magazine to give them that rickety old weapon feel.