Newbie dumb question

If your barrel has an o-ring it might have a possibility of coming out. Perfectly fine for single shot and RAW guns that don't have barrel o-rings. 

Believe it or not some pellets shot better backwards at 20-25 yards dropped birds deader than dead compared to shooting them normal and at 50 yards about an inch shooting out of an old Theoben Rapid 7/12 through its magazine.

When I try pellets my new guns don't like I try shooting them backwards and sometimes group better believe it or not.

I lessen the breech o-ring saying ELVIS HAS LEFT THE BUILDING risk by lubing with Lemon Pledge first. (Tom Holland style!)