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Hi Harry and welcome. Yes, it has a Threaded Bull Barrel - 1/2 x 28 tpi - With Flash Suppressor: https://www.budsgunshop.com/product_info.php/products_id/415014578/ruger+mark+iv+target+.22lr+semi+auto+pistol -------- Cheers, stay safe and enjoy!

it depends on the model check the different models 40126, 40178 and 40176 are threaded see Ruger https://ruger.com/products/markIVTarget/models.html