Kinetic Development Group SAS – SCAR Adaptable Stock System

Kinetic Development Group has announced their SCAR Adaptable Stock System that uses a.. ACR stock? In short, its an adapter plate and the ACR’s folding stock. The system still allows the SCAR to function when folded and looks to resolve a common complaint about the rifle system, the “flimsy” stock.

The full SAS system retails for $299 and can be found with KDG and their dealer network. 


Full Press Release Below:

Kinetic Development Group is proud to announce the debut of their SAS – Scar Adaptable Stock System.
Just a few months ago, Kinetic Development Group launched its company with the promise to bring solutions to the small arms market for high quality firearms. They started with the FN SCAR as many SCARs are deployed with our Special Operations Forces.  They also recognize the 16S and 17S are increasingly popular with American shooters and law enforcement. 

 Their first products, the MREX (modular rail extensions) for the front end of the SCAR has been very popular.  The KDG front and rear sling points have also brought the SCAR into the year 2015 as far as QD sling solutions go.  Well, they have just addressed another common complaint about SCAR.  Some refer to it as the SCAR’s “UGG Boot” like stock system.  The KDG S.A.S (SCAR Adaptable Stock) is a serious improvement on the SCAR OEM stock system.

Form…. Why is this solution a near perfect marriage of a very well designed and reliable rifle and the excellent ergonomics of the Magpul ACR stock?   It doesn’t take a rocket scientist to compare the two stocks and decided which is more robust.  MagPul is famous for their reinforced polymers and most would argue nobody can beat them at their game.   There are many empirical reports from the field complaining about broken SCAR stocks.  To add to that strength is the KDG SAS coupling that is made of 6061 T6 aluminum billet that is black hard coat anodized.  That not only reinforces the stock, but also the open rear end of the SCAR’s thin extruded U-shaped receiver. And to top it off, the KDG SAS assembled stock system weighs approx. ¼ pound less than the all polymer factory SCAR stock assembly!

Fit & Function… All SAS kits come standard with 7 positions of length adjustment, cheek weld height adjustment, an AMBI QD sling attachment point, a weatherproof battery compartment, and a side-folding feature. Like the factory stock, the weapon can be fired with the stock folded. KDG also added an optional set-screw to allow users the option to eliminate any play between the stock and receiver.

Aesthetics – There are many SCAR owners that are simply not fans of the factory SCAR stock. Its clunky feel and look take away from the amazing rifle they just purchased. The new SAS not only improves the function of the SCAR rifle, it looks a hell of a lot better as well.

 Finally, the stock and adapter comes fully assembled from KDG. There are no tools required to install on your SCAR! The whole system retails for $299.00 and will be available for purchase at or a dealer listed near you found on their

 For questions, please contact KDG at


Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • Anonymoose

    Nice. How about mounting an ACR PRS stock though?

  • BrandonAKsALot

    I never get excited over upgrades for the SCAR, but I like this. I love the look of the ACR stock and it looks like it operates similarly to the M93/UBR. It looks like the locking latch even lines up correctly for when it’s folded. I don’t hate my SCAR stock, but it’s definitely rattley.

  • Joshua

    The story of the ACR. The only thing we did right was the stock.

    • Green Hell

      Actually, ACR did a lot of things right and it is arguably a better weapon than SCAR 16. The only things Magpul did wrong was the front heavy weight balance (maybe would be better without QD barrel), unreplasable pistol grip and selling the rights to Remington.

      • I can’t immediately think of any reason it is better than the SCAR, besides the stock.

        I don’t even really like its charging handle.

        • Green Hell

          Well, let’s see. The stock is much better, the charging handle is right above the handguard and is non reciprocating, the bolt catch is right under the trigger guard and ambidextrous, reciever accepts all AR-15 mags and Pmags without modifications, handguards are replaceable and longer (polymer MOE style handguard is available too), QD sling mounts are everywhere, quick barrel replacement without any tools (potentially there should have been the whole caliber kits too). I think that’s enough to call it better designed than SCAR-L. The whole other matter of discussion is how much both of those rifles weight and bulk is justified over any modern AR-15, which are still somehow slimmer and lighter than almost any other 5,56 weapon.:)

          • The CH on the ACR doesn’t inspire confidence in me.

            Bolt catch is potato potahto. It’s certainly cool to be able to hit it with your trigger finger, but I don’t see that making a big difference in practice.

            The SCAR wasn’t designed by a company that was making their own magazine that only barely fit AR-15 magwell dimensions, yes, that’s true.

            The ACR’s barrel replacement method adds weight and has proven to be nothing but trouble when trying to retain zero for many folks.

            Here are some advantages the SCAR has that you may not have considered:

            1. Overtravel. The SCAR-L has a considerable amount of bolt group overtravel, giving the magazines ample time to bring the cartridge stack in line for feeding.

            2. Larger, stronger bolt. The ACR has a normal AR-15 profile bolt; this is great if you’re just shooting 5.56, but larger bolts are a big advantage in durability if you want to be doing the multicaliber thing.

            3. Copious amounts of underlug. The SCAR has a ridiculous amount of underlug – that is the bolt carrier is allowed to come back a considerable distance (something like three quarters of an inch!) before unlocking occurs. This helps smooth out the operating cycle, it gives the bolt carrier a running start to help assist unlocking, and it allows unlocking to occur after pressure levels have dropped, aiding extraction.

            4. Hilarious mass ratio. The SCAR has a mass ratio that probably exceeds that of any of its competitors. I do not know what the exact numbers are on it, but the bolt carrier is enormous relative to the bolt. I’d put it somewhere in the 6-to-1 to 7-to-1 range. To understand why mass ratio is important, see this post.

            5. Lightweight gas block and tappet. Tappet is just better; I really have a difficult time with conventional short-stroke piston operation. It puts a ton of mass up front while compromising your mass ratio. Why do that? Use a tappet instead.

            In practice, the SCAR may have many flaws; that’s not for me to say as I don’t have the kind of trigger time on one to feel comfortable doing so. However, from a design perspective it looks quite sound to me, whereas the ACR looks unremarkable.

          • Green Hell

            Okay, Nate, I see that we are talking on a whole different leagues, as an average and mostly theoretical shooter from a restrictive country I can only judge unfamiliar guns by their ergonomics while you obviously have much better understanding of the technical side. May I ask you, what do you think about SCAR 17? Can it be the best modern .308 rifle on the market?

          • I am not the person to ask about the SCAR 17. It’s certainly one of the lightest .308s, but I’ve heard of folks who were dissatisfied with it in the precision role.

  • Adam James Pugh

    I assumed after watching a video from IWA 2015 that the products above were being marketed by KRG (Kinetic Research Group) rather than Kinetic Development Group. The two name are awfully similar – does anyone know if the two companies are affiliated in any way?

    • J Galt

      No we are not affiliated in any way. KRG was incorporated 5 years ago in 2010. We built a good reputation in the precision rifle segment and we’re disappointed to see a brand new company choose a name so similar.

      • Adam James Pugh

        Totally understandable J.

  • Green Hell

    This stock looks extremely good, but still has a little prostetic feeling to it on the SCAR. I better wait for Magpul to release their own SCAR stock, there must be a reason they started making a fire selector for it. An ACR style charging handle would be nice too.

  • Herr Wolf


  • RicoSuave

    How does this compare with the Stryker Industries system for the attaching the ACR stock ? I think this is 6061 Aluminum vs 7075 for the Stryker adapter hinge ?


    Kinetic Development Group – want to make some money? Build a model that will attach to the CZ Scorpion EVO3…