Thanks, I already have a huge canister of high quality desiccant, but had planned on getting some of those packs already.

The more I think about it, the more I'm leaning towards buying the Pelican 1740 with polyethylene foam already in it, cut out 4 rifle slots and then just store pistols in the 4th slot until I either finish my other AR or decide to buy a dedicated pistol case. I just hope I'm able to cut out the polyethylene foam as easily/cleanly as I think I can.