My neighbor purchased a PHO911 GUARDIAN 209 DERRINGER 4.5mm a few days ago.We were watching the football game when around half-time,we turned down the volume on the TV because of allthe commercials.My neighbor saw a Big rat run behind the curtains in the family room.He loaded up his GUARDIAN 209 DERRINGER while I Quickly went to the refridgerator for the rest of the 24 pack of beer.We waited only 20 minutes before the rat reappeared next to the TV set.My neighbor said he had a special way of loading his pistol to give it more velocity.He finally took aim and fired.The 4.5mm bullet went right through the rat killing it Instantly.It went through the rat and into his TV.I laughed so hard that beer foam was comming out of my mouth.I'm Glad I was'nt around when his wife returned from work.I'm buying One.