Keep in mind what is on the other side of the wall.
Gun cabinet carpet.
Polymat is a multi purpose non woven felt which comes in a roll.
Wall safes are smaller and are often used for small handgun collections or personal property.
Speaker cabinet carpet comes to mind.
A carpet runner can be another great option if you want your guns and other valuables to stay dry.
Even the best gun safe is only as good as its material.
And make sure there is no real chance of someone drilling screwing or nailing anything from the other room into your cabinets and potentially into a gun.
I m going to toss out something else to consider as you build this inside a wall.
Other gun owners go in for tool chest drawer liners coupled with a 3m mounting tape for lining their gun cabinets.
100 high uv olefin fiber.
Cut the liner to the shape and size of your shelf.
The style of gun cabinet you choose will usually depend on the size you need.
This is great for keeping your safe dry to.
This organizer kit for your safe is incredibly easy to install in any gun security cabinet or safe.
Available in red really a wine or maroon green brown black and gray.
The durability of this shotgun cabinet hardware will give you the peace of mind you need.
Then attach the included loop fabric shelf liner with a staple gun or upholstery tacks.
Floor safes tend to be larger to accommodate long gun barrels or multiple firearms.
Another effective material for most security safes is automotive headliner material.
It is easy to cut fit and mold to your desired shape.