Works but difficult install, mind the gap - GG&G Benelli M4 Shotgun Looped Rear Sling Attachment

I installed this using enclosed instructions on my Benelli M4. No pics on instruction sheet and YouTube had nothing either. That wasn't a big issue, but removing the retaining locknut on the threaded rod inside the stock after you remove the buttpad was very difficult. Using the supplied tool that allows you to screw the rod out of the receiver about 3 turns was super hard. I had a hard time getting the set screw tight enough to prevent it from spinning, and once I was ready to remove the tool (leaving the small gap between the receiver and the stock required for the sling attachment), I thought I'd break the Allen wrench for sure trying to loosen the set screw. I ended having to use a "cheater" made of a 3/4 inch socket wrench with a small socket on the end of the Allen to break the set loose. The rest was easy. It did leave a gap between the receiver and the portion of the stock that should touch the curved part of the trigger guard, though. I figured it must but couldn't find any confirmation on that before buying it. This increases the length of pull of your trigger finger a bit but I have big hands so it's maybe more natural now. The gap doesn't look great but not too bad.