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Ronnie, yes Sir, the Ruger Mark Target with threaded barrel has a 1/2-28 TPI thread pitch which this is threaded for. Cheers and stay safe!

yes it will fit a threaded MK IV

YES, this has 1/2-28 TPI thread pitch which is on Ruger Mark Target. I hope this helps!

Yes, as long as you have the threaded barrel on your MarkIV