Marv has completed his build!
It tips the scales at a mere 1 lb. 1.2 oz., hardly noticeable hanging out there on the end of the muzzle of a 6.7 lb. gun!
PS: interesting light mount, no? Primary Arms put rails on top of their scope, so Marv couldn't stand to leave them empty; thus a pistol light becomes a rifle light. No shadow from the front sight or barrel with it up there either.