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- Barrel Thread Adapter Made 5.56 to .308 1/2 x 28 ID to 5/8 x 24 OD Black New 1pcOpens in a new window or tabBrand NewRM 51.49+RM 70.23 postagefrom United StatesFree returns80 soldTop-rated sellerTop-rated sellerjdmxpert (22,203) 96.3%