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Hi Thomas, the barrel is threaded 1/2x28 Stay safe & have a great day!

by James G - Lifetime Points: 81117 Hi Thomas and welcome. This model has a 7.5-inch barrel with a 1 in 7 twist rate and threaded 1/2 x 28 tpi with removable A2 style Flash Hider. Cheers, stay safe and enjoy!

The Thread pitch on this model is 1/2"×28.

Thread pitch is 1/2"×28.