Hello, I'm quite angry with this. The sling itself is fine. It's the buttstock harness which is annoying me. I have no idea on how to install it. Please help.
Without wishing to sound like I'm taking the piss, you wrap it around the stock, the little loop with velcro goes through your sling point and the other loop is where you attach the rest of the sling. Maybe if you post some pictures we can see where you're going wrong?
Personally I'd say that if you have that rear sling swivel at the bottom of your stock, just use that and ditch the buttstock strap. It's mostly for guns without a rear sling point.