These are old beat up models that needed a second life. The grey one was painted and stripped before the conversion work, and the other two were just primed so i didn't strip them.
Alot the pieces were spare bitz from land raider crusader and dreadnought kits. If you want a little more explanation on how one of them was done just ask.

Heavy Bolter & Assault Cannon:

Heavy Flamer & Multi-Melta:

Heavy Flamer & Heavy Flamer:

Comments, Criticisms, and Questions Welcome