On my DEFENDER 2000 M4 with SOPMOD stock I use there single point adapter and a Black Hawk single point sling
The sling just says BLACKHAWK? Dont know whats it is called.
but it has a Bungee type cord with a lobster like claw
Anyway it works great and is SIMPLE
My other Carbine is a Bushmaster lower with a VLTOR telestock and a LMT M4 upper
I use the OLD NSN# Sling Adapter and my Regular M16 Sling and use PARACORD attached to Front sight
I like this set up alot and is Very cheap
Plus the Barrel/Flash Hider dont BANG my leg like the single point SLING type