This is a Advanced Technology Part, model A.5.10.2548.
This grip screw set can be used for a new build or as a replacement for that frustrating OEM flat head screw. It comes with a steel 1/4-28 x 1" Hex bolt and a steel star washer.
Features:
AR-15 / AR-10 Hex Head Pistol Grip Screw Set
Steel Star Washer
Manufactured in the USA