Hello everyone,I pulled my beloved diana 27 out tonight for a few shots,and the pellet won't even leave the barrel. This rifle fired fine a week ago,I am assuming my piston seal decided now was a good time to die.did the later model 27's come with a synthetic seal? Based on how fast this rifle went from hero to zero makes me think its synthetic,and it just crumbled away. I know most 27's came with leather seals,but this is a later model.