The CN5F Castle Nut is designed for the Vltor A5 system, is 0.1" longer for better coverage, and ensures backward compatibility with certain stocks and receiver extensions.
It features enhanced staking notches that are 25% longer and deeper than TDP spec, with four equally spaced notches for more staking options.
The CN5F is made from 4140 PH steel, available in multiple colors including Flat Dark Earth, and is manufactured in the USA by Forward Controls Design LLC.