Forward Controls Design CNF Billet Castle Nut

Call them old fashioned, they like their castle nut staked to prevent it from rotating loose on the receiver extension and causing malfunctions. Army manual calls for the castle nut to be staked in two places. While they're not in the "more is better, bigger is better" camp, there are times less isn't more. The TDP spec castle nut is a simple and robust fastener that is almost perfect for the job it's tasked to perform. Over the years, they've consistently come up with two minor gripes, first is its staking notches seem rather shallow and short, second is they don't enjoy using the castle nut's wrench notches as serrations (their fingers invariably find their way to these sharp cutouts) to rotate it towards to the end plate while installing it. CNF (Castle Nut, Forward Controls) is based on the TDP spec castle nut, with couple of changes: 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 nu