Re: heavy barrel suppressors
Your obsession with a "heavy barrel" is unwarranted.
The SPS Tac has plenty of meat to accept threads for a can. Seen cans on much smaller barrel profiles.
Heavier, stiffer barrels will most likely show less of a POI shift with a can installed than a smaller contour barrel will. Hanging anything that weighs a pound or more off the end of a barrel will cause a POI shift to some degree IME.
The YHM, GemT, Jet, SAS, TB will all work fine on your rifle.
I have an SAS Ti on my 308 SPS Tac and it works just fine. Have another coming to dedicate to my whisper with the same barrel profile.
IMO, get a 308 can to run on your 223 for the reasons mentioned above. They are more versatile. I am having some adapters made so I can run my 308 cans on my ar15's if the mood strikes me.
My shooting pard has a QD YHM can that he uses on various rifles, none of which have a larger barrel contour then the SPS Tac. It works well.