Quoted: ... Anybody ever seen one (besides in an armory)?...
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Saw quite a few when I was in the army – invariably 55-gallon drums full of sand and mounted at an angle.
Nowadays commercially made bullets traps are very common at LE and correction facilities. However, they tend to be pricey.
I use a body armor test panel myself (square piece of ballistic material used for test firing) but I’d think those are not easy to come by. I admit I’m a little worried about bullet bounce-back. An old unit of body armor would also work.
If I were looking to make one right now for handgun rounds, I’d probably fill a 5-gallon plastic bucket full of sand, snap a lid on it, and make some sort of mount out of 2X4’s that would elevate it a bit and hold it at an angle (so any errant bullet would go through the maximum amount of sand).
And, if anyone other than myself was going to use it, I’d tape a target on the lid to make it real clear where exactly the muzzle should be pointed.