Yeah, that's a possiblity!Have never tried it. If you are that worried, rig the launcher in a rest or vise and pull the trigger with a string. Make sure to yell out "Ya'll stand back. I'm not sure what this is gonna do!"
Great, thanks for the info!Ive fired several hundred para flares as well as fin stabilized hi-altitude flares out of P2A1's. (I was a demo shooter for HK in the eighties) they gobble them up easily. These were all produced by Fiestal, GMBH., but if your Czech flares are 26.5mm they should also be fine. Just realize the propellant is most likely black powder and you need to clean the launcher accordingly.