Hatsan Bullboss weak?

The antibounce mechanism is shaped like a u and gets spread apart and sticks. You will need to squeeze it together a bit. Repeat as necessary. I used moly lube in the the metal contact surfaces and it worked much better for much longer
That would be the case with the older de-bounce part that was one piece, but the newer ones are 2 pieces and are junk :( The arms are not connected and can move independently causing all kinds of trouble.