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Its 9rds + 1 in chamber. The CMMG Anvil MKW-15 combines the MUTANT mid-size platform with the ballistic energy of the .458 SOCOM round. Machined from billet 7075-T6 aluminum, the receivers on the MKW are designed to harness the full potential of .458 SOCOM. The receiver accepts standard AR magazines, which will feed the cartridge. The typical 20 round magazine will hold 7 rounds of .458 SOCOM, the typical 30 round magazine will hold 9 rounds.