I had a bit of a problem yesterday. Fired my HW45 and large quantities of smoke came from every where, not just the normal slight waft from the barrel (its fairly new). On opening the action I discovered that the breech seal was no where to be seen. I fitted the spare that came with the pistol but I'd really like to know what happened to the original one.

Do they vaporise or just fall out ? Is this a common occurrence?

Thanks
Mike