the title states it. I really had flat headed screws. when I got my wolf. I could not beleave that it had on in its forarm. well it does not have one now. I switched it to an hex head.
info:
m6 (sorry can't remember length)
4mm hex



good switch too, fits better. the old screw was an beast to removed and replace. the new. I can almost tighten it all the was down the forearm