For anyone considering this mount it is excellent and I just finished testing it with Acog TA31F attached to a 11.5 in M16. After zeroing the scope I fired  approx. 400 rds in short burst to longest of 30rd burst then removed scope fired several rounds and reattached.  It held absolute zero it is truly surprising to me how with one throw lever it can be so precisely made. Take Care and hope this helps someone.