Accu-shot's Rail Mounting Fastner Set used for mounting 1913 rails (BT15 and BT17 or the BT34) consists of two (2) 10-32 T-Nuts and two (2) 10-32 x ¾" Button Head Cap Screws.
Nice quality - feel sturdy - heavy weight but barrel lined up a little off center - more space on right side than left - minimal but noticeable - should not affect accuracy as scope is aligned on receiver - will see after it goees to range