It gets a bit congested, but it's handy for moments when you're dicking with shit 2 handed, and an SBR wants to get horizontal on you in 2 point, primarily an issue when bent forward..
I actually prefer outside rear of stock and inside rear of handguard for short rigs and about 2/3rds forward on the handguard for long rigs. When I need an SBR to hang down straight for a while I'll shift the front HK hook to a SLAP plate at the back of the receiver and cinch up a bit, and it's still quite shootable. Placing the rear attachment on the outside keeps the sling out of my face and gives plenty of slack for support side shouldering without getting choked by the sling.
Stand by for a lot of opinions.
You can see how it's arranged with the endplate option here.
Attached File