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Thanks to all for the information! Have a great week! Pam!!!

It is 1:8 inch

Good evening to you!! The twist rate on the Zion Z-15 is 1:8. Hope this helps. Have a good rest of your day. 🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

Hi Pamela and welcome. The IWI US, Inc. ZION Z-15 Rifle has a 16" 4150 Chrome Moly Vanadium heavy barrel with a 1:8 twist rate. Cheers and stay safe!

It has a 1:8 twist rate. 👏🏻💯‼️

The twist rate for the IWI Zion Z-15 Rifle 5.56 NATO 16 in. M81 Camo is 1:8.The versatile 1:8 twist configuration features 6 right-hand (RH) grooves. This specific twist rate optimizes the barrel's performance across a wide range of common 5.56/.223 bullet weights.Technical SpecificationsBarrel: 16" 4150 Chrome Moly Vanadium HBOperating System: Direct ImpingementGas System: Mid-lengthOverall Length: 33" (stock collapsed) to 36.25" (stock extended)Weight: 6.9 lbs

The IWI US, Inc. ZION Z-15 Rifle has a twist rate of 1:8 inches. Stay safe & have a great day!