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Hi Stanley, this Lower Receiver is marked 'MULTI CAL' and is compatible with all calibers within the AR-15 platform. Stay safe & have a great day!

Hi Stanley and welcome. Yes, you can enlarge the picture on Anderson's website here to see: https://andersonmanufacturing.com/am-15-complete-lower-m4-open.html ------------ It is labeled Multi-Cal as it supports multi caliber AR chambered uppers such as 5.56/.223/300BlK, 450 Bushmaster etc. Cheers and stay safe!