doing my build.  What's the deal with the rear takedown? I'm gonna assume the detent from the takedown pin end will be partially covered up, but i'm more concerned about the detent spring.  I think it's cool having it tapped with a set screw, but how much of the detent spring am I suppose to cut off?  I cant seat the screw.

I hate to have instructions for this, but I didn't know this would be a step that's required.  Speaking of which, it's a pain in the ass trying to get that set screw in place with the spring pressure. Don't see anything about modifications with a standard kit on the site either.

welp, I went ahead and cut off 6 rings.  Seems to work fine....  I cut 2, because that's how much shorter it is, where they have the new hole, compared to the original spot.  And cut 4 for the length of the set screw.

For the BAD556-LW lower, I used NSZ85's trick to use a small magnet.  Cut 3 coils, and the magnet holds the wrench and set screw together while compressing the spring.  Still a PITA, but the magnet does help.

I like grips with the beaver tail.  Turns out, my Magpul MIAD with beavertail backstrap will not fit this billet lower.  Is there a beavertail grip that will fit this lower without modification?

I think the BCM grip will. I forget which model is the beaver tail.

BCM Grip Mod 1

I went with a Magpul MOE +. The rubber overmolding seemed to help.

There you go!