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CNF (Castle Nut, Forward Controls) is based on the TDP spec castle nut, with couple of changes:
1. Staking notches angle changed from 45 to 30 degrees, this results in longer (25% longer than TDP spec) and deeper notches than found on TDP castle nuts.
2. Number of staking notches increased from 3 to 4, spaced equally on the CNF. The castle nut is to be staked in two places. FCD does not advocate staking in more than two places; CNF's 4 staking notches mean that, at all times, 3 will be visible and available for staking. It simply gives the user more staking location options.
3. Coarse serrations on the wrench side of the nut, a single use feature to make it easier while rotating the CNF towards the end plate.
Army manual calls for the castle nut to be torqued to 38 to 42ft/lb, and staked in two places. While FCD is not in the "more is better, bigger is better" camp, there are times less isn't more.
It is FCD's opinion that a castle nut should be staked per TM. CNF's longer and deeper notch reinforces the belief that once installed and staked, it will not loosen without the user's deliberate action. We love the idea of quick detach, but some things on an AR are meant to stay put, and considerable effort was made to ensure that by the original designers. CNF is a continuation and evolution in that direction.
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