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FORWARD CONTROLS DESIGN LLC A5 CASTLE NUT

Color
A5 Castle Nut, Black
Brownells #
430103538
MFR #
CN5F BLK
UPC
697566711138
$22.80
Coupon Code
Purchase Limit Help

In stock

Specifications
Buffer Tube Type:
Rifle
Item Length (Inches):
0.500
Color:
Black
Item Width (Inches):
1.360
Buttstock Fit:
Rifle
Item Height (Inches):
0.150
Quantity:
1
Item Weight (lbs):
0.810
Material:
Steel
Make Model Fit:
AR-15.Universal
Restriction
Prop 65 restriction:
WARNING: This product can expose you to chemicals including metallic nickel, chromium and lead, which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Description
CN5F (Castle Nut, A5, Forward Controls) is an extended version of CNF Forward Controls Design (FCD) have been making since 2018. CN5F is designed specifically for the superb Vltor A5 system, CN5F is 0.1" longer, and is as long as FCD can make a castle nut while ensuring backward compatibility, and the stock's ability to fully collapse on Vltor's RE-A5 and FCD's RE5F. Note: not all stocks will fully collapse on A5 compatible REs. For more information on the differences between RE-A5, RE5F and RE10/A5SR, please follow this link: https://www.forwardcontrolsdesign.com/Vltor-RE-A5-vs-RE10-A5SR_ep_78-1.html

CN5F aims to cover as much of the threaded area of a receiver extension (RE) as possible. It could be made longer, but it will run into backward compatibility issues with some REs' timing when installing the castle nut and end plate on the RE. CN5F is made specifically for the Vltor A5 system, and it will allow even the longest carbine stocks to fully collapse on RE-A5 and FCD's RE5F. While CN5F will also work on standard TDP spec length RE, the additional length of the castle nut will prevent the carbine stock to fully collapse.

Other than its length, CN5F shares common features with its smaller brother, CNF.

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, FCD have consistently come up with two minor gripes, first is its staking notches seem rather shallow and short, second is FCD don't enjoy using the castle nut's wrench notches as serrations (FCD's fingers invariably find their way to these sharp cutouts) to rotate it towards to the end plate while installing it.

CN5F (Castle Nut, Forward Controls) is based on the TDP spec castle nut, with couple of changes:

1. 0.1" longer.
2. 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.
3. 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 are not advocating 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.
4. 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.

It is FCD’s opinion that a castle nut should be staked per TM, CNF's and CN5F's longer and deeper notch reinforces the belief, that once installed and staked, it will not loosen without the user's deliberate action. Forward Controls Design like 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 and CN5F are a continuation and evolution in that direction.

CN5F is billet machined in 4140 PH steel, and black nitrided (Cerakoted FDE, OD green, and burnt bronze also available). As with everything Forward Controls Design produces, it is proudly made in the USA.
  • Weight: 0.51oz
  • Material: 4140 PH
  • Made in USA

Prop 65WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

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