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The thread pitch on a Smith & Wesson M&P 5.7 Optic Ready 5.7x28 is 1/2x28.

Hi Greg and welcome. The thread size is 1/2 x 28 tpi. Cheers, stay safe and enjoy!

Hi Greg, the barrel is threaded 1/2 x 28 Stay safe & have a great day!

barrel is threaded with 1/2 x 28TPI