I appreciate the advice! I’ll be needing one of those spanners SOON. I need to install a sling attachment plate on one rifle, and a 6 position retractable stock on the other, so I’ll be needing to REMOVE that nut with the notches in it. I’m glad you mentioned about the mag-well vise block! I was wondering if we were just going to have to hold the lower down on a flat surface, or remove the pistol grip and clamp the top and bottom of the lower receiver in a vice (protecting the surfaces of course). I’ll pick up the mag-well vice block WITH the spanner.
You say I can get all these tools at Brownells right? THANKS! :-)
Etc. (Same link)