OP - and anyone else for that matter - I've had the Colibri stick in the barrel of my FVSR. Pulled the trigger, heard a pop, but no splash of the round down range. Sure enough, pulled the bolt, looked through the barrel and no daylight at the end of it. Had to use a cleaning rod to push the projectile out of the muzzle.
Maybe I have an out of spec bore or something but it happened once out of 30 or so rounds. Please make sure the projectile exits the barrel!
Eh, they'll eventually come out!