I want to put a buttstock on my hunting AR that has a sling stud built in on it. It looks like the B5 SOPMOD has one, as well as the VLTOR EMOD. Am I correct on each? I want use a standard hunting sling on the rifle. The B5 is winning if they both have a stud on it. It looks like has it from pics, but I haven't held either to be sure! Thanks guys!