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Hi, Yes 1:7 is the correct twist rate

Harry yes the 1:7 twist is correct Specifications and Features CORE15 14046 5.56 NATO (also accepts .223 Remington) Direct impingement gas operated semi automatic 16" barrel with nitride finish and A2 flash hider ********1:7" twist******** 30 rounds capacity Forged 7075-T6 upper and lower receivers M4 feed ramps CORE15 HARDCORE V.1 billet charging handle Forged A-frame front sight base M4 style molded polymer handguard Six position collapsible stock Weight 6.5 lbs Black