Scarlett has it right. It was just in the 9mm. When they stepped up to a double spring the tensions were wrong for the 9mm. The .40 had enough power to cycle it just fine but the 9mm saw fte's in the hands of weaker or limp wristing shooter. I'm a left handed shooter so brass to the face every now and then is normal. I'm not saying mine isn't without it's mishaps. Most of my fte is due to gripping to high. When I draw I grip extra high and I'll get a nice slide bite when I shoot causing it to not cycle proplerly. For that reason I'm looking into this. http://gripforceproducts.com/ Made in Ohio