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Tanner, barrel thread pitch was the non poplar 13.5 x 1mm on the discontinued HG4617. Canik moved to the more standard and popular 1/2 x 28 thread pitch of the HG6481 for a wider selection on common muzzle devices. Cheers and stay safe!

Tanner, HG4617 ($886) has a 13.5 x 1mm lefthand threaded barrel. These are older and either out of production or no longer imported to the US. HG6481 ($840) has a 1/2 x 28 righthand threaded barrel. Other than that they are the same. Have a great day!