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The Colt AR-15 SP1 is primarily designed for .223 Remington cartridges. While it can safely chamber and fire some 5.56 NATO rounds, it is not recommended due to potential differences in chamber dimensions and pressure levels. Using 5.56 NATO in an AR-15 SP1 may lead to increased wear or safety issues, so it's best to stick with .223 Remington ammunition to ensure safe operation. Always consult the manufacturer's guidelines for specific recommendations.

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2mo ago

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