Recently posted about me purchasing five boxes of underwood ammo in various calibers...well I went and shot all of it up today and I must say, I have never been more disappointed in my life. Did it live up to its reputation of performing at the velocities stated? I don't know. But what I can tell you is that every single gun I fired with underwood ammo had some sort of failure. Whether it was ejection or feeding, it happened at least once out of every mag I shot it out of. And trust me I WISH I was exaggerating with that statement. And just to prove my theory that it was poor quality ammo, I shot a box of Winchester between my gen 4 21 and kimber pro raptor and had not a single failure. But my sig sp2340 jammed and so did my gen4 27. So short story long, I will never in my life purchase this junk again. As for you individuals who have nothing but good results with this ammo, consider yourself as lucky as those who own a gen4 19 and have no ejection issues.