I did not receive the ammo purchased. They substituted regular defender for PDX1 defender. Yes THEY ARE DIFFERENT in the bullet crimps. PDX1 HAS 8 STAR CRIMP . Regular Defender 6. There ballistic characteristics are also different. The FBI only received PDX1. I was disappointed but I kept it as the ammo provider figured since 9mm ammo is hard to come by. Typical bait and switch and are now the 3rd vendor I have ordered PDX1 ammo that has delivered the basic Defender. Do not buy the fact they are the same. Do your own research, don't take my word for it. This seems as a industry wide scam hoping that most new gun owners would not know the difference. Buyer beware from these sites. Though I have contacted the 3 vendors about there errors, i have yet to receive any explanation. They ammo is in short supply and taking advantage. Just a final FYI. These vendors websites ALWAYS showed the box to be purchased with The PDX1 labeling. I'm probably wasting my time writing this, because of the lack of action or even acknowledgements, that they purposely shipped the wrong product. - - - Tom