If you're mounting a barrel or installing a castle nut, you should be greasing the threads with Aeroshell 64. It not only ensures your torque values are more accurate, but it is designed to prevent the corrosion that occurs between two dissimilar metals.
We decided to offer this convenient, and inexpensive, screw top container of it (.5oz) so you can just add it to your order, and have plenty left on hand to carry you through dozens more builds before you'd need more.
