I have a BAM B21 .177 which preceded the B30 as I recall. I'm CONUS where I bought the gun @15 years ago. I know there are some differences between the B30-B21, what exactly the difference is I don't know. My B21 specs don't match yours. Don't remember all the specs but it does have a 28mm compression tube and shoots 7.9's in the high 8's - low 9's. I'm thinking my B21 trigger was Theoben based and needed some TLC to make the trigger at least decent. I went through the whole gun when purchased new. Diamond in the rough I reckon. That said, I would rather have a 26mm tube like yours. If the gun is new-old stock the seals could be shot. After 15 years mine got gummy and rotted.Your gun may be a factory detuned gun for a specific regulated market?
I've got a B21 also and a B40. Just want to follow. Does the B30 have the telescoping cocking lever like my B21?