That will work. Take a closer look the moderators shown above when they are not attached; you will see that where they screw in to the barrel that it the same and that because the stock GK1 has a longer barrel than the shorty, Torquemaster provides these different size spacers to fill that gap. Thus on a shorty you might not need much of a spacer if the end of the barrel and the end of the air chamber are the same? Only if the chamber is longer than the barrel would the moderator need to be modified and if that is the case, send an IM to IMADMAN whom designed it as he might be able to just tweak the CAD design so that Torquemaster has a different file to 3d print a version for you.
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