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This barrel is non-threaded. You would have to purchase a threaded barrel.

Hi Justin, no sir, this has a 3.5 in Barrel with Integrated Flash Hider, it is not removable. Actually, Sig contradicts itself, it calls it both a flash hider and a muzzle brake on the Sig website. At any rate, you cannot remove it. >>> Stay safe & have a great day!

Hi Justin and welcome. This model is not threaded. Better picture here: sigsauer.com/sig-mpx-copperhead.html --------- Cheers, stay safe and enjoy!

sorry it is a nonthreaded barrel