Received my goods today from RDSC, they stupidly enough insisted on age verification and signature required for a QD stud, during covid times, but oh well.
Drilled a pilot before going full 1/2''
It chipped a little on the side, but the QD cup lips are wide so it's all hidden
When the drill bit passed a big chunk of foam just fell out, cut the rest with a box knife, next time I will drill a pilot hole a size bigger to help.
Red Loctite her in there, holding the square fitting with a mini Westcott and fasting the QD cup with a QD sling mount clicked in it.
Waiting 24 hours for Loctite to dry, tomorrow i'm filling area around nut with JB weld.
Finished results from the exterior