CNF Castle Nut, FDE

<p>Call us old fashioned, we like our castle nut staked to prevent it from rotating loose on the receiver extension and causing malfunctions.&nbsp; Army manual calls for the castle nut to be torqued to 38 to 42ft/lb, and staked in two places.&nbsp; While we&#39;re not in the &quot;more is better, bigger is better&quot; camp, there are times less isn&#39;t more.<br />

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The TDP spec castle nut is a simple and robust fastener that is almost perfect for the job it&#39;s tasked to perform.&nbsp; Over the years, we&#39;ve consistently come up with two minor gripes, first is its staking notches seem rather shallow and short, second is we don&#39;t enjoy using the castle nut&#39;s wrench notches as serrations (our fingers invariably find their way to these sharp cutouts) to rotate it towards to the end plate while installing it.<br />

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CNF (Castle Nut, Forward Controls) is based on the TDP spec castle nut, with couple of changes:<br />

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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.<br />

2. Number of staking notches increased from 3 to 4, spaced equally on the CNF.&nbsp; The castle nut is to be staked in two places, we&#39;re not advocating staking in more than two places, CNF&#39;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.<br />

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.</p>