CMMG AR Conversion Magazine MK4 /AR15 5.7x28mm FN 32rd

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CMMG Magazine, 5.7X28MM, 10 Rounds, Fits CMMG MK4/AR15, Matte Finish, Black 54AFC44

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CMMG Magazine, 5.7X28MM, 32 Rounds, Fits CMMG MK4/AR15, Matte Finish, Black 54AFCC8

Magpul PMAG 30 AR/M4 GEN M2 MOE 228042 5.56x45mm/.223 Rem 30rd Multi-Cam Tropic Polymer Magazine