Hey guy's wondering if anyone can reccomend a good and cheap sling for my AR. It has the standard swivels one in the stock and one up front. I bought one that was "supposed" to fit and it didn't and the guy offered to refund me my $$ then just disappeared.. So i'm trying to stay under $20 and I've seen quite a few in that range but I want to make sure i'm getting the right one so I know it fits before I dish out $$ for it.