ya it's the pilot.
I bought a ruger mkIII 22/45 so I could have the ultra light frame, and also the finish matches the pac-lite barrel perfect. the gun is sooooo light.
Bought the gun, and replaced the insides with all volquartesen parts.
stuck the barrel on, and now it's almost one of my favorite guns!
I have the volquartsen carbon fiber barrel for my 10/22 with a thread adapter so I can shoot the pilot on my 10/22 also. pistol is way more fun because you can shoot regular rounds and they stay subsonic(way way quieter) in it, but with the rifle you have to shoot subsonic ammo to get it to be quiet.
so splurge on the pistol, you'll have more fun with it, unless you want to shoot subsonic rounds through it.
also, buy winchester dynapoints to shoot through your handgun. They are quiet, reliable, CLEAN, and cheap. get em at wal-mart. the REM golden bullets are super dirty, don't reccomend. can't go wrong with CCI either...
good luck