Stop talking to people who don't know what they are talking about. Crosman (Chinese factory) flipped back and forth on the breech seal used; "B12-00-14" and "B22-00-3" (and yes, those part numbers came from my head without looking them up). The most recent models are using the "old" seal again.
I have yet to figure out why people talk to clerks at companies listed on pieces of paper as the "manufacturers representative"- companies where the only guy that was ever trained on the product line quit years ago and who now don't know dick about the product line they "represent"- no offense to anyone in particular.
B12-00-14 is a $2.00 seal and can be had from vendors who know the product line.