take a standard AR firing pin, use the existing head as the head for the ciener pin replacement. turn the rest of the pin down to ciener pin dimensions. I used an electric drill and a grinding wheel. chucked the small end of the firing pin in the drill, turned on the bench grinder, and used patience and a small water container to keep it cool. once the pin is the correct diameter, you need to put the retainin pin groove in it. match it carefully for size with the original pin.Then you need to cut the ledge where the spring rests. finally cut the new pin to the correct length. cut it a bit long, and trial fit it. I have a detailed description, e-mail me & I will provide. according to my source, the AR pin conversions last longer than the originals.I have only used mine about 1500 rds since replacing it, so I cant testify to longevity.