Steel Taper Pin, Plain Finish, Meets ASME B18.8.2, Standard Tolerance, #6 Pin Size, 0.341" Large End Diameter, 0.299" Small End Diameter, 2" Length (Pack of 10): Amazon.com: Industrial & Scientific
Internal Threaded Taper Pins
Tapered Pins
COLT AR-15 A4 FRONT SIGHT TAPER PIN BLACK | Brownells