Skateboard shop...buy a sheet there for 10-15 bucks and you'll have enough for multiple sets and patterns.
I think the stuff I've used is 3M "Safety Walk", intended, as "chemo" has mentioned, for stairs. It has a rubber finish.
Here's the front strap of my S.A. double-stack .45 ACP:
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The adhesive is very aggressive and stays put.
Stuart
where did you get it from?
I know how to make a holster thanks to some airsoft dude:
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