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Kevin, this BCG is built specifically for 7.62x39.

Wat you have selected is not a BCG but a 7.62x39 rifle the BCG in it is 7.62x 39 specific specs for the rifle Specifications and Features: CMMG MK47 Mutant AKM Semi Auto Rifle 76AFCD7 7.62x39mm 16" Medium Taper Profile 4140 SBN Barrel .311 Grove Diameter 6 Groove Rifling 1:10" Twist Rate Barrel is threaded 5/2 x 24 TPI CMMG SV Brake Upper Receiver is 7075-T6 Aircraft Grade Billet Aluminum Lower Receiver is 7075-T6 Aircraft Grade Billet Aluminum CMMG RKM15 15" KeyMod Hand Guard CMMG Single Stage Mil-Spec Style Trigger Magpul MOE Pistol Grip Magpul MOE CTR Collapsible Stock Uses Standard AK-47 double stacked magazines One 30 round magazine Unique Upper and Lower, not compatible with other AR-15 Variants Overall Weight 7 lbs unloaded Overall Length Collapsed 32.75" Matte Black Finish

Hi Kevin, this BCG is built specifically for 7.62x39. SPECS - 7.62x39mm 16" Medium Taper Profile 4140 SBN Barrel .311 Grove Diameter 6 Groove Rifling 1:10" Twist Rate Barrel is threaded 5/2 x 24 TPI CMMG SV Brake Upper Receiver is 7075-T6 Aircraft Grade Billet Aluminum Lower Receiver is 7075-T6 Aircraft Grade Billet Aluminum CMMG RKM15 15" KeyMod Hand Guard CMMG Single Stage Mil-Spec Style Trigger Magpul MOE Pistol Grip Magpul MOE CTR Collapsible Stock Uses Standard AK-47 double stacked magazines One 30 round magazine Unique Upper and Lower, not compatible with other AR-15 Variants Overall Weight 7 lbs unloaded Overall Length Collapsed 32.75" Matte Black Finish