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I love the fact that the AR-15 platform is as stripped down as possible. That also might be its biggest weakness. Eugene Stoner did a great job by using the buffer tube on the rear of the receiver as the attachment point for the stock, but with the recent craze of making rifles as short as possible, that buffer tube is becoming the “long pole in the tent.” Shrinking it down isn’t easy. Safety Harbor Firearms thinks that they’ve come up with a solution: the Kompact Entry Stock (KES).

The idea is relatively simple. The design of the bolt carrier in the AR-15 is intended to make it as easy as possible to clean, meaning that the bolt carrier extends all the way to the rear of the upper receiver. Slicing down that bolt carrier allows some of the buffer system to reside inside the upper receiver instead of the buffer tube, thereby reducing the length of the whole system. It’s a pretty slick solution, and the execution by Harbor Safety Firearms seems spot on.


Installing the Kompact Entry Stock means replacing the entire buffer system, bolt carrier included. The package from Harbor Safety Firearms includes a new bolt carrier (but no firing pin, cam pin, or bolt), a new buffer, and a new buffer spring in addition to the tube and stock. The buffer is smartly designed to fit into the rear end of the bolt carrier for a little more space saving.

The process to get the whole thing in place can be a little tricky, but it makes logical sense. Remove the old buffer tube, swap out the bolt carrier, then place the new stock on the rear of the receiver. To keep things simple Harbor Safety designed the buffer tube to act as the key to the whole design, locking everything in place. Once you position the stock with the buffer and spring inside on the gun you insert the buffer tube and crank it tight with the provided hex wrench. The whole thing locks solidly into place.


Instead of riding along the buffer tube, the stock is attached to two rails that slide alongside the receiver set. There’s a button on the right side that allows the stock to move into one of three fixed positions, and a cotter pin on the rails prohibits the stock from sliding free and falling off.


One issue that I ran into with this stock involves the rails. In order to work properly the rails need enough room on each side of the receiver set to move freely. This is fine for most firearms, but the only SBR’ed AR-15 receiver I had at the time when the stock arrived was my Franklin Armory receiver which had two QD cups machined into the side. These QD cups were great in the field, but they were directly in the path of the rails for this stock. Those people with non-standard AR-15 receiver configurations might want to double check that there is enough space for the rails before making the purchase.


While the stock might appear to be very skeletonized and minimalist, the fact is that on the range I felt that it was very comfortable. Despite the lack of a full length buffer tube there was still plenty of space for me to rest my cheek on what little buffer remained for a solid cheek rest. The stock felt very solid while shooting as well, none of the twisting issues that I was anticipating were present whatsoever.


The folks over at Harbor Safety Firearms have done a damn fine job here. They’ve got a solid product that reduces the overall length of your AR-15 rifle without impacting the reliability. The only real issue I have with the kit comes from the proprietary bolt carrier. The supplied bolt carrier isn’t as slick and smooth as I’d like, but since it isn’t a standard component there’s no way to swap it out. I’d love to see a nickel plated version offered in the future to fix that. Otherwise this is a solid product that works exactly as expected.

Specifications: Harbor Safety Kompact Entry Stock
MSRP: $350 [Website]

Ratings (out of five stars):

Quality  * * * * 
The bolt carrier is a little rough in terms of texture, but otherwise the kit is well thought out and manufactured.

Function  * * * * *
It works, and it works just fine. No reliability issues whatsoever.

Overall  * * * *
The KES a great solution for those looking for a PDW stock for your AR-15. It’s not quite a five star product — there are other similar stocks that look better and others that are less expensive — but it works and doesn’t break the bank. I think I’m gonna keep it on my rifle for a while.

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  1. $350? Ow… For that price tag, I would have expected a NIB coated carrier. This thing shows some promise and it might find a place on my mk18 rig if I ever decide to go for a small foot stock to replace my UBR.

    One of the biggest problems I have is large stocks binding up on my full sized vest. Did you do any testing with a carrier?

    • “One of the biggest problems I have is large stocks binding up on my full sized vest.”
      Do you mean the stock is too long with your vest on? Even with a collapsible stock?

      • More too tall. I’m a rather barrel chested guy so I wear large plates in a medium vest. Unfortunately, that makes it very hard to get the stock solidly into my shoulder pocket (it’s a less than 4″x3″ area) and still have my rifle low enough that I can look down the sights.

        I’m actually looking at upgrading to a smaller toed stock.

        • Ah, I get it. With a full OTV or IBA, I just put some skateboard tape on the buttstock of my rifle and shot off my chest plate. With just a stripped plate carrier, I can shoulder it.

        • I like the full wrap coverage of the MTV too much to go with just a carrier. If there’s one thing that engineering school teaches you, it’s that fragmentation is a cold, hard, bitch.

  2. I wanted a cqb stock like this prior to using one on an airsoft rifle. Key word wanted, try it before you buy it.

    • Griz, why would you take a pass now – weight? Harder to deploy stock? Rails catching on other equipment?

      • Purchase to shoulder and lack of cheek weld. Discomfort with trying to look down the sights. If I was clearing a room with a trained team maybe, but not for self defense or range for me.

  3. Pleasantly surprised at the price. My only gripe would be, how short do you really need your rifle to be?

  4. So how long is this stock? How much shorter does it make the rifle in its collapsed state vs. a standard collapsible stock?

    That seems like a key piece of information missing from the review…

    • I agree. This really doesn’t look that much shorter than a milspec style stock. I really don’t think I would want to pay 350 bucks to make my rifle slightly shorter and no longer compatible with regular bolt carriers.

  5. There can be a thing called too short, I’m familiar with it lol, to be useful. If I’m working down the hallway but can’t get locked in unless it is pulled out some then what did I gain?
    The length issue on CQC entry isn’t with that end of the rifle usually. Even on vehicle ops a solid check weld is more important than length as you bounce the dot to the target.
    I’m gonna have to see one and try it.

    • It might be okay with a plate carrier, but it’s still a lot of money and your rifle will no longer work with a regular carrier. Might not be a big deal now, but a few years down the road you might be screwed if they are no longer made. Then you have a $350 paper weight.

  6. I guess if you really want to have a more compact platform, why not start with one that can accommodate a folding stock from the get-go?

    While I really appreciate innovation, I’m becoming increasingly leery of platforms that “kind of” keep some compatibility with mainstream. That path leads to compromises anyway, without as deep a base for repair or modification later on.

    • Exactly why I built a Sig 556 SBR as my backseat gun – not as good as my AR’s, but reliable, relatively cheap and the sidefolder makes it pretty damn small even with a can.

  7. 8 inches closed. 13.5 inches fully extended. Seems like it does shave a couple inches off the length.

  8. Unless you’re running a very thick plate and carrier, this is $350 you can spend elsewhere. More of the same “tacticool” for the inexperienced.

  9. Over engineered. Arfcom figured out how to do it with stock carriers years ago.

  10. MVB industries already came up with a way to use any mil spec BCG. There unit is about the same price as this and does not include a bcg, but it lets you use any regular bcg and a battery assist device.

    It’s going on my next SBR.

  11. Full auto bolt bounce? The bolt carrier group has a purposeful mass. That’s why Colt went back to full auto bolt carriers. Or is this spring stiffer and/or buffer stiffer/heavier to compensate?

  12. “The design of the bolt carrier in the AR-15 is intended to make it as easy as possible to clean” I have often looked at the BCG and wondered why it had to be that long. Thanks for an explanation.

  13. I was very close to getting this but went with the LWRC UCS instead, mostly for comfort reasons and convenience, as it uses a standard bolt carrier and requires no unusual steps for assembly/disassembly.

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