This device is easy to install. Remove sliding portion of stock, slide adapter down to Buffer tube nut. It self centers when installed properly. Tighten screw with provided star wrench. (Washers are included for civilian buffer tubes.) Reinstall butt stock. Install sling. The only thing not explained in the instructions is removal of the butt stock. This requires an additional tool to stick under the lever and lift to get past the last indent. Almost anything that will fit under the lever and allow you to lift can be used.
The only disadvantage to this adapter (and any other that doesn't replace the buffer retaining nut is the stock will not lock in the fully collapsed position. I also had to trim about 1/8 inch of padding to fit the rifle into my form fit case.
My one complaint is the ring isn't large enough to fit two hooks on the same side.
If I had access to a gunsmith or spanner wrench I would go with replacing the buffer nut. Otherwise this is an excellent choice for a single point sling adapter.
Pros: Easy to install and set up
Cons: Loop is too small for two hooks
This review was written in the old system and had content requirements that are different than reviews written today.