A5 Buffer System Kit | Kratos, VLTOR, Sprinco, FCD, BCM

This kit gives you everything you need for a complete A5 buffer system.

• Kratos 8-position receiver extension
• VLTOR A5H2 Buffer
• Sprinco Green Spring
• FCD CNF Castle Nut
• BCM QD End Plate

 

 

Kratos Buffer Tube

The Kratos Design Group A5 Receiver Extension is fully compatible with VLTOR’s patented A5 system. This receiver extension is slightly longer than the traditional M4 receiver extension to utilize rifle length springs and A5 buffers and is designed to work with Mil-Spec dimensioned M4/AR-15 type collapsible stocks.  For AR15/M16 applications, it must use Vltor A5 or A5 compatible buffers & rifle length recoil springs We reccomend the Sprinco Green Spring for most applications.

This receiver extension tube can also can be utilized as a replacement receiver extension for the AR-10 rifle.

Dialing in the perfect length of pull is easy with eight adjustable stock positions.

The Kratos Design Group buffer tube is made of impact-extruded 7075 Aluminum and is made to withstand rigorous use. The finish is a Type III Class 2 hardcoat anodize. 

Weight: 4.3oz
Material: Impact-Extruded 7075 aluminum
Finish: Type III, Class 2 hardcoat Anodize
Made in USA

 

VLTOR Buffer:

• A5H2: 5.33oz

Sprinco Green Spring:

Sprinco AR-15 rifle buffer springs are made from high quality Chrome Silicon wire stock. Sprinco heat treats, shot peens, and treats each spring with a proprietary formula that retains spring efficiency for as long as you have your rifle. The Sprinco Green rifle buffer spring is a great option to improve the long-term reliability of your AR-15.

Features:

• For rifle length buffer tubes
• Color-coded green
• Standard power
• Made from chrome silicon wire stock
• Heat treated and shot-peened

Sprinco has extensively tested this setup and have concluded that it works great with the VLTOR A5 stock setup. It also helps you to easily identify which power spring you have in your AR-15 if you have a habit of changing your setup constantly.

 

Forward Controls CNF: 

Call us old fashioned, we like our 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 we’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, we’ve consistently come up with two minor gripes, first is its staking notches seem rather shallow and short, second is we don’t enjoy using the castle nut’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.

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, we’re 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.
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.

It is our 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.

CNF is billet machined in 4140 PH steel, and black nitrided. As with everything Forward Controls Design produces, it is proudly made in the USA.

We’d like to thank Ash Hess for letting us use parts of the Army/Air Force / Navy TM for CNF’s installation instructions, on the back of the card.

 

BCM QD End Plate

BCM® Receiver End Plate with socket for Quick Disconnect (QD) swivel.

Machined from steel, and easily accommodates staking.

Like all BCM products, Made with pride in the U.S.A.