It has 1 hole for screw, 1 long line for easier screw positioning for the second screw and also one hole for fast unlock rifle sling. Only bad is that it does not include screws so you will need to google for proper ones.
This sling has the QD adapter. They have ball bearing lock.
A great choice of slings is at gorillasurplus.com. You may check for yourself rifle slings, and of course a lot more including airsoft guns, camping gear and knives.