Thanks for the response guys!
rauchman: You're right. They have several varieties, and one in particular that the "Front Sight Base is drilled and tapped for SET SCREWS for barrels with or without taper pin holes/flats. Set screws are positioned low to “WEDGE” against the barrel for a very solid fit." Good stuff for a decent price. Can't tell if it comes with the front sight post, spring, & detent, etc. But I will find out. They even have a version without a bayonet lug, which might be a good idea considering this is for a Dissipator and there's no room for a bayonet anyway.
STL_Nik: I think your's has the same set screw design as rauchman's, for less than half the price. PLUS it looks like it comes will all the trimmings (i.e. front sight post, spring, detent, and sling swivel). It mentions a 5th set screw, gotta find out whats that for. Only the .750 version comes w/o the bayo lug, but no biggy.
I will be contacting both vendors to get more information on what each one comes with and exactly how they mount to the barrel. Thanks for the awesome finds. As always, ARFCOM to the Rescue!