Hatsan Bully blow back?

[Olschool]

I picked up a Bully in .45 a while ago and it's always had some air blow back into my face every shot.
Am I missing an O ring or is that normal?

[maraudinglizard]

Have the Hercules .45 bully and it does have blow back. I bought it as a refurb from Field Supply. I spent a fortune on o rings and they all get blown out. I think the probe does not completely seat itself to keep the o ring from blowing out. I have not contacted Hatsan yet. The gun is very accurate with my casted slugs, the blow back is what bothers me the most. I haven't shot it anymore until somebody comes up with a solution. I own a Umarex Hammer and there is definite blow back from it and is stated in the instruction. They just put out a new magazine for it that reduces that. I haven't seen anything from Hatsan in regards to the issue. I have a lot going on right now and the bully has to go to the back burner until I can get where I can spend time to contact Hatsan USA. Hopefully someone else that has one that can chime in with their experience with the gun.

[Olschool]

Thanks! Yes it is distracting, but I really like the power and accu accuracy.
It's a hunting gun for pigs and yotes, so I can deal with it