Gunsmithing Bolt Plug Timing?

7mmsgmag

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Full Member
Minuteman
Mar 13, 2013
5
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Hey all,

Not sure I'm posting this in the right section, but I have a quick question that I haven't been able to find an answer to!

I was reading through some barreled actions specifications on here:

Barreled Actions

The fifth one down says "Bolt Plug is Timed to Trigger". Probably something simple but I have no idea what this means! If anyone can shed any light on this I would be most grateful. Thank you all in advance.