Ok here is my $.02. The castle nut is supposed to be staked lightly in order to replace the buffer tube which will wear out. If it is staked very heavily then the wrench will brake before it removes the castle nut plus in the case of my sport it is staked in two places. As far as the gas key, if you notice the staking has the side material firmly into the knurling on the bolts. it is staked fine. the pictures posted of the other gas key show to be overstaked and if you should ever have to remove the bolts for whatever reason the material is going to break right below the right rear lower part of the gas key bolt making the gas key unusable. It is very possible to over stake something and the second set of pictures show that fact. all staking is supposed to do is cause a tightness at the shoulder of the bolt, it is not to break the base material. This is my opinion only with just enough knowledge added to be dangerous to myself and the people around me...LOL