Smoke Composites Carbon Fiber AR-15 Buffer Tube/Stock

Smoke Composites is a firearm accessories manufacturer located in Minden, Nevada. The company is specialized in making carbon fiber parts for AR-15 rifles. As you can imagine their products have the main advantage of the carbon fiber material – they are extremely lightweight. Lightest version of their buffer tube/stock weighs less than 4 oz (112 grams (3.95 oz)).

The main body of these stocks are made of 35-50 carbon fiber and the threaded portion is made of 7075 aluminum alloy. Smoke Composites offers the stocks in two lengths called Short Pull and Long Pull. The first version is for carbine length buffers and springs and the Long Pull is for the rifle length components. These stocks work with any mil-spec buffers and buffer springs. You can also order a custom length stock, but that will cost you additional $35.

They also have two versions of the butt plate portion. One is called Open Shoulder Plate and the other one is called Closed Shoulder Plate. The latter has an additional strap attaching the toe of the butt plate to the buffer tube.

Left: Open shoulder plate. Right: Closed shoulder plate.

The longest (rifle length) and heaviest (closed shoulder plate) version of the stock weighs a little less than 5 oz. So the difference between lightest and heaviest versions is only about 1 oz. Here are the tech specs for different types of Smoke Composites stocks:

These stocks are available on the Smoke Composites’ website at MSRP of $189 to $219 depending on the length and type. You can also add a QD sling mount for additional $19.95 and a Magpul Enhanced Rubber Butt-Pad for $32. There is also a $12 carbon fiber spacer which drops into the rifle length tube and allows it to accept carbine length buffer and spring.
It is really interesting to see the carbon fiber technologies developing and involving new players. Hopefully, that will lead to the decrease of carbon fiber parts prices.

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
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  • I would probably opt for the rubber pad. IME carbon fiber is pretty slippery.

    • Jared Vynn

      Skateboard tape could fix that. Wouldn’t be the most comfortable though.

      • It would also destroy your cloths or any other gear that it may contact while shooting.

        • Rick O’Shay

          Somehow the guys who put skateboard tape on the grips of their handguns and then carry concealed don’t seem to mind.

          • No they learn real quick that it destroys their cloths too. IMO when I see so called EDC guns with skate tape, unless it is worn the hell, I don’t believe them.

            Anyways you don’t need that much grip for a stock, the rubber or mild checkering on most stocks is more than enough.

          • Jared Vynn

            I much prefer Hogue’s​ rubber handalls or VZ grips over stippling or skateboard tape, besides the sandpaper effect when shooting the additional wear on clothes is not worth it for my EDC purposes.

        • Jared Vynn

          A quick rubber dip could solve that at the cost of some of the grip, but you would still have a nicely textured rubber surface.

          You also lose some of the recoil dampening of an actual rubber buttpad though.

        • Giolli Joker

          Truck bed liner coating?

          • Or just pay the $50 for the Magpul butt pad. Unless you have that stuff lying around and have experience applying it, chances are it will cost you more and not look half as good as paying them to install the butt pad.

          • Giolli Joker

            Agreed. But I liked the brainstorming game. 🙂

          • Jared Vynn

            It’s great for innovation, even if you just brainstorm to figure out what wouldn’t work.

          • raz-0

            You can get tread tape that is meant for damp environments that is very similar in texture to spray on truck bed lining.

  • noob

    The Windham Weaponry Carbon Fiber SRC AR-15 weighs 5.85lbs. How much of that is the stock and receiver extension?

    • noob

      Also how does CF do under repeated impacts? Would a CF cored fire control group with hard metal strking and sear engagement surfaces be able to meaningfully reduce lock time?
      And is there a CF box magazine?

      • Rick O’Shay

        A CF fire control group? Holy $hit I can’t imagine the cost.

      • Carbon fiber isn’t strong on all axis like metal is. So in the case of the tube the fibers are laid so it is strong front to back. Take a hammer to the tube from any other direction and it will fracture.

        That is what you give up when you go to carbon fiber. As they say there is no such thing as agree lunch.

        • Jared Vynn

          “A free lunch” you mean?

          And I believe the different weaves, epoxy, and shaping of the CF will yield various different strengths for any given axis. Some would fracture from a blow on a given axis while others would flex and bounce back I believe.

          • There are ways to mitigate the weaknesses that come with using carbon fiber, but it is no where near as isometric as using metal. Particularly when you are working around a design speced for metal, so you can’t adjust the shape to mitigate the weaknesses.

            That is why SIG completely redesigned the slides of their popular pistols, the new larger extractor mitigates the weaknesses in MIM parts due to imperfect binder distribution (not sure if that is the right term, the concept was explained to me by someone else).

          • Jared Vynn

            I believe you have the correct terminology, the binder allows for the injection molding which is filled by debinding and sintering. I think Ruger has gotten the process down the best out of all the manufacturers

      • Jared Vynn

        Cost would be prohibitive as would benefits for a CF FCG. Going titanium would be better for durability.

        • Twilight sparkle

          Or there’s polymer which has already been done multiple times in the past. I don’t think you’re going to be saving enough weight to justify any material other than steel though.

        • randomswede

          A carbon/aramid fibre integrated stock lower with a titanium skeleton that connects the pins and screws.
          Don’t think that will be built anytime soon, but I like to dream.

    • Jared Vynn

      You have about 1.5 pounds from the stock and receiver extension (not including buffer and spring) and the upper reciever group (minus BCG and CH) typically weighs about 3 pounds and the lower (aluminum) unpopulated is another half pound. Adding in the BCG and buffer I believe you get roughly under 2 pounds (BCG is 1.5 pounds and the buffer is from 4 to 8 oz).

      I don’t know the specs for the SRC, but I would assume most of the weight is from the Upper, BCG, stock and extension much like other ar15 rifles.

  • jcobbers

    Smoke Composites has been around for a few years, I build a lightweight AR with their open long pull stock about 2 years ago and it is a fantastic component. I didn’t opt for a but pad, but I did put an ACE foam cheek pad over it for added comfort which worked just about perfectly. I also got their carbon fiber endplate, which is lighter than anything else out there at just a few grams, but I wouldn’t recommend staking it as it is not metal and I don’t know how it would take to being properly staked into place.

  • DIR911911 .

    but can it hold up to the rifle butt to the forehead test??

  • PK

    Is the buffer spring truly just against that bracket, internally? It looks as though the stock is quite open at the rear, and could allow debris inside the gun.

    • MSG1000

      The actual buffer tube should be sealed into the lower receiver, the stock itself mounts on the outside. The buffer tube has always looked quite fragile but is far more durable than you’d think.

      I don’t see anything extra open about this product, the last picture just looks like a cut away.

      • PK

        Fourth picture into the article, you’ll see the two stock/tube assemblies side by side. That sure looks to me as though we’re seeing the back end of that hollow bracket, and the spring/buffer is right there, open to the outside.

        To me, that’s a substantial amount more open to debris than any other stock I’ve seen. The rear of the tube is normally shut most of the way with a pinhole, certainly not wide open.

        • MSG1000

          Ah, for some reason I was thinking these were collapsible and it was just dark in there.

          It looks you have a point, it’s going to depend on how well the rubber pads seal on. It seems like these are more for competitions to reduce weight.

          Otherwise they could just thread a metal cap on the end like for the front to seal it up.

  • Some Guy

    Never really got the whole lightweight stock thing. If anything the stock is a great place to add weight to improve the balance of the rifle.

  • Anomanom

    Going for the mid-war sten gun look? Really, that looks like someone welded it together out of stuff found in the garage. I know it isn’t, but…


    I really like these but wouldn’t want to afford it. ♡♡♡