The CN5F Castle Nut is an extended version specifically designed for the Vltor A5 system, ensuring compatibility and full stock collapse on certain receiver extensions.
It features improvements over the standard TDP spec castle nut, including longer and deeper staking notches, and coarse serrations for easier installation.
Manufactured by Forward Controls Design LLC, the CN5F is made in the USA from 4140 PH steel and comes in various finishes including Olive Drab Green.