.223/5.56 Brass Cases collected from indoor shooting ranges are once fired brass have been magnetically screened and machine sorted.
Rifle Brass - .223/ 5.56 Brass - Capital Cartridge
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223 Rem 5.56 NATO Dirty Brass Shells Empty Spent Bullet Casings
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Rifle Brass - Republic Ammunition
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223 Casings Once Fired - US Reloading Supply
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5.56×45mm NATO - Wikipedia
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