Stake your nuts!
The Forward Controls Design CNF is the improves upon the design of the TDP nut in several ways:
It has 4 staking notches instead of 3, allowing you to get the recommended 2 stakes in without over or under torquing the nut. Often you can add a third stake if desired. The notches are changed from 45 to 30 degrees allowing more material to be pushed into the notch (See the comparison picture).
The CNF also has serrations on the back of the nut which, while being attractive to the eye, also allow you to hand tighten it easier during installation.
Finally, the CNF 4140 steel and is finished with black melonite which means it is both durable and beautiful.
We believe in the Forward Controls CNF so much that it comes standard on all of our rifles and complete lowers.
Use a small amount of grease (We recommend Aeroshell 64, formerly known as 33MS) on the receiver extension threads to ensure the nut reaches its proper torque and is easily removed if needed.
Using a torque wrench and castle nut tool like the Forward Controls JCW (Joint Castle Nut Wrench), torque to 38-48 Lb/ft.
Stake in at least 2 places with a punch such as the Starrett 117C center punch.