I emailed them on an unrelated matter earlier this year looking for a spare breech plug and they indicated that each rifle was unique. If I wanted a spare, the MZ would have to be sent in, and they'd have to make one custom to that rifle. That said, if your rifle shoots to your expectations and chambers and extracts without problem, I'd probably give the stink eye to the plastic snap cap being out of spec and knock it out with a cleaning rod.