Infinite Product Solutions Muzzle Comp

Got a IPS 3 Port Comp, Comp threads are 1/2-28. External Threads for mounting Cans and whatnot are i believe 13/16. The Comp is for 9mm but i used it on my 556 for some breathing space no issues. It is rattlecanned yea but nothing a cup of rubbing alchohol wont fix, $40 obo prefer local but can ship on buyers dime