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




mateothe7th (verified owner) –
Seems like a very good extension in my opinion. The color is much more green/brown and not some of the bright greens of others. That’s hard to find and appreciated as that’s what I wanted. Only wish it had some drain holes, but that’s a wish not a necessity.
Colton Boothe (verified owner) –
It does A5 receiver extension things.
pedritomelendez1234 (verified owner) –
The best tube
CS (verified owner) –
Amazing quality and exactly the shade of FDE I wanted. Kratos has great quality parts.
dbrownmc (verified owner) –
Like everything else Kratos Deaign it’s amazing quality is at the high end and for the price you will not find better. These are the only buffer tube I use anymore.