I'm not at home right now but I can take a pic when I do. Have no idea on how many they made but know I jumped on it when they did. Kinda wished I jumped on it when s&w had them available for ~150 for the m&p's. They are threaded 13.5x1 which is fine Bc that's the piston I have for my evolution 9mm
You can never have too many guns.