Seems to me that if the vacuum seal holds, it should work well for long term. When you pull a vacuum, all water moisture flashes to vapor and gets pulled out. Every nook, cranny and crevasse will be free of water - it cannot hide unless it is an airtight area. I would NOT do to a wood stock for that reason.
Yep - I also would add a desiccant pack and an O2 absorbent pack for insurance!
I'd sure like to hear from folks who have tried it to see if I'm missing something.
A Democracy is when two wolves and a lamb vote on the dinner menu. That is why this country was not designed to be a Democracy.