You need to know that the King Tuck, not unlike many other holsters of its type, will loosen with time. That is that the leather relaxes the firearm will rock back and forth. Plus, the grip on the firearm will loosen.
You may want to look into a model that is adjustable and able to take up this looseness. Look into Old Faithful Holsters which comes as a complete holster or as a kit. Another is Cleveland's Holsters.
I carry a 1911 and had a King Tuck. After the holster relaxed ,the pistol began to rock back and forth, With the rocking motion, the edge of the holster would switch the safety "off". Also, the straight across top of the Kidex pocket allows the top of the pants to fold into the holster which makes re-holstering difficult with one hand. Cleveland's Holsters takes care of both problems.