My dad has had this (or similar) system installed on about 150 linear feet of his roof for almost a decade now. No more water damage from ice dams. He lives in Michigan.
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Oh, and I had 20 square feet of Kydex waiting for me on the porch when I got home.
[Awesom]
Making a holster in anticipation of your new civilian SAW?
If it were me with the materials, I'd be lucky to get a holster for my house key.