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Hi Earl, this has a SB Tactical SBA3 Brace and the twist rate is 1:8 Full specs here >>> https://diamondbackfirearms.com/portfolio/db15-10-5-56-nato-w-9-pc-m-lok-rail-odg/ Stay safe & have a great day!

Hi Earl and welcome. The brace is the SBA3 from SB Tactical. It is adjustable to 5 positions and the barrel has a 1 in 8 twist rate.