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Palm-Size Two-Shooter: The Heizer DoubleTap Review

by G&A Staff   |  August 21st, 2012 39

Both 9mm and .45 ACP versions are the same width. Note the discreet, flush-fitting lanyard loop near the base of the butt.

The newly announced Heizer Defense DoubleTap combines elements of several previous types of small, palm-size personal defense handguns into a configuration that is truly original, bolstered by seven pending patents and a hitherto unseen trigger design. It looks different and is different. Most people’s first-look reaction to the Double-Tap is a double-take.

In essence, the DoubleTap is a small break-open two-shot pistol with vertically stacked over/under barrels atop a frame that is configured to resemble and fit in the hand like a small semiauto. It is available as either a .45 ACP or a 9mm, and is offered in either aluminum or titanium frame construction with a variety of finish options. There are no steel versions.

The three-inch .45 ACP and 9mm dual-barrel upper units (both barrels in each unit are the same caliber) are interchangeable on the same frame. Two pulls of the trigger will fire first the top barrel, then the lower barrel. It is really small (only 3.9 inches tall), really slim (only .665 inch wide) and really light (only 12 ounces in the aluminum version) It’s the smallest and lightest .45 ACP in the world, in fact. And before you ask, yes, it is definitely a handful.

Is the DoubleTap a derringer? Actually, that’s what most people in the crowds standing around the Heizer booths at this year’s SHOT Show and NRA Conventions quickly went to calling it. Heizer doesn’t. Heizer calls it the DoubleTap. The term “derringer” is actually a universally generic misspelling of the last name of Henry Deringer, the famed 19th century maker of small pocket pistols. So many copies were made of his original 1852 “Philadelphia Deringer” pistol, and his name was so often misspelled, that the term “derringer” soon became standard for any pocket pistol.

The original Deringer was a single-shot muzzleloader. With the advent of cartridge technology, such pistols began to be offered in two-shot break-open form, and most people today think of a “Derringer” as a small over/under two-shot gun. The famous .41-caliber Remington Derringer (in production from 1866 until 1935) is the archetype of this pattern, which uses a cam on the hammer to alternate ignition between the top and bottom barrels. The basic design is still employed by several modern derringer makers in calibers up to .45 Colt and .357 Magnum. In the 1970s and 1980s the now-discontinued High Standard .22 WMR derringer was a very popular law enforcement backup gun, and many are still in use today. So if to you a “derringer” is a pocket-size two-shot pistol with no upper limit on its bore size, I guess it’s OK with me if that’s what you call the DoubleTap.

High-Tech Heritage
But it’s a derringer with a difference. Several, in fact. For one, it’s manufactured by Heizer Aerospace, in a factory just south of St. Louis that spends its spare time making Boeing’s advanced new 777 airliner wings. (Heizer Defense is a separate company, partnered with Heizer Aerospace.) I recently visited that plant, and I have to say that you don’t really appreciate the concept of precision manufacturing until you see a one-piece 20×145-foot slab of aluminum being laser-gauge machined to meet the tolerance standards necessary to go into an aircraft designed to fly nearly 500 people on long hauls around the world. So precise, in fact, that the system even has to adapt on-the-fly to different metal-expansion effects due to air-temperature differences between one end of the wing and the other while the continuous uninterrupted shaping is done. Cutting small pistol frames and barrels to firearms standards is a walk in the park by comparison. Henry Deringer would have been speechless.

As for the design details of the DoubleTap itself, those features are equally high-tech. Foremost among them is the trigger, which utilizes a patent-pending roller-cam mechanism to provide one of the smoothest straight-back double-action pulls I’ve ever felt on any handgun this size. As shown in the cutaway image, the backward movement of the trigger rolls the bearing smoothly up an incline to the release point while compressing a wire-type hammer spring. Pull weight is a consistent 10 to 11 pounds, about the same as a smooth-tuned medium-frame DA revolver. Every time the concealed hammer falls, the firing mechanism alternates between barrels. When you first load the chambers and close the action, the top barrel is always first to fire (so if you loaded only the bottom barrel, you’d have to pull the trigger twice to make it go bang).

The spring-loaded barrel mechanism breaks open via a joined pair of grooved ambidextrous thumb-latch release panels on opposite sides of the frame. Slide them forward, the barrel pops open, the fired cases pop out. Switching barrel/calibers takes all of 10 seconds (if that). Barrels in both calibers, incidentally, are available either ported or unported. There are no grip panels, just the metal grip-frame itself, which is fully “checkered” both sides with the HD (Heizer Defense) initials, done as part of the overall exterior CNC manufacturing process.

In the hand, the DoubleTap feels like a small auto, and the grip angle mimics classic 1911 ergonomics. The base of the grip holds a two-round polymer “speed strip” speedloader (for either 9mm or .45 ACP, makes no difference), allowing remarkably fast reloads. The sights are rudimentary. Which brings us to the question: What was the purpose behind the concept and development of the DoubleTap pistol in the first place?

So What’s It For?
The DoubleTap is an up-close point-and-shoot gun. DoubleTap developer and Heizer Defense president Ray Kohout makes no claim that this pistol is intended to be anyone’s primary personal defense tool. It is a backup gun for when all your other chips have gone in the pot and a last-ditch moment is right up in your face—just as all modern derringers are intended to be. Two shots are simply not enough for a primary weapon. At the same time, two shots are a lot better than nothing if that’s all you have, and many people will doubtless carry the DoubleTap alone due to its weight, convenience and power.

Ray says the basic idea in his mind was indeed something like a serious-caliber derringer, but shootable. “Real” derringers have very small grips and frames, and are hard to grasp and control, particularly when you’re in a hurry, particularly if they’re chambered for a powerful cartridge. Plus, he felt the triggers on such guns “sucked.” (Ray’s somewhat direct.) So what he wanted to build was a backup gun that was as slim and small as possible, that was at least as easy to grasp and hold on to as a small 9mm or .45 ACP autoloader, with a good, controllable trigger pull. He took his basic ideas to Heizer Aerospace, and the DoubleTap is the result.

Yes, the gun is a handful. (I might have mentioned that already.) But it’s not meant to be a pistol that you (or your spouse) take out to the range and shoot all day for fun. It’s for those times when the last thing in the world to worry about (or even notice) is recoil. Nor, with its three-inch barrel, does it give much up at all in ballistic effectiveness compared with any of the many three-inch 9mm and .45 ACP semiautos on the market. When Ray brought a pair of preproduction samples up to PASA Park for a live-fire session, we chronographed it with a pair of popular commercial personal defense loads on my tried-and-true Oehler M35 Chronotach. Hornady’s 115-grain 9mm Critical Defense ammo averaged 1,042 fps, and Hornady’s 185-grain XTP .45 ACP load averaged 867 fps (standard deviation: 11). Compare those to “standard” catalog ballistics.

As for hitting the target in a hurry? We set up an IPSC target with a silhouette Shoot-N-C center at seven yards, and I double-tapped the DoubleTap, just point-and-shoot, fast as I could. The shot pairs typically were about three inches apart, in a vertical string, essentially center-mass. In slow-fire you can get them closer together, even with the rudimentary sights, but a three-inch spread at 21 feet in a real hurry is good enough for me. Besides, you need to remember that the first round out of a DoubleTap is always from the top barrel, which means it will always print slightly higher with a true double-tap delivery.

It’s been a long time since I’ve regularly carried a backup in addition to my primary concealed carry pistol. The thought, quality and design features that have been put into the DoubleTap have led me to seriously reconsider my posture. Base retail price for a nonported anodized aluminum-frame DoubleTap is $499 for either caliber. A top-of-the-list ported titanium model with MIL-STD finish is $799. Additional barrel “conversion kits” (either caliber) are available for $249 nonported and $319 ported and come with two extra Heizer speedload strips. Ray’s gonna sell a million of these guns. Probably one to me.


Find out about the price and availability of the firearm covered in this article at, where you will gain instant access to the inventory of Davidson’s Inc., one of the nation’s largest factory authorized firearm wholesalers. customers know instantly if the firearm is available and can select from offers presented by dealers in their area. The selected dealer then immediately ships the firearm via Federal Express. Perhaps best of all, guns purchased at are covered by Davidson’s Guaranteed Lifetime Replacement Program Fast. Easy. Hassle-free.

  • Scott

    I guess I'm a sucker for cool little pocket break-top pistols. I love my NAA Ranger, I expect no less from the Heizer Double Tap so…I've got one ordered.

  • Scott

    I guess I'm a sucker for cool little pocket break-top pistols. I love my NAA Ranger

    • Scott

      Hey! Only half of my comment was posted.
      The other half was that I have one on order and I expect to carry it as a deep concealment weapon and as a back-up to my primary CCW.

  • Alan_T

    I suppose it has it's applications ………. but I'm not in any big hurry to own one .

  • eeeee

    I want one! Too bad I am broke :(

  • Richard

    Fugly, two-rounder plus change, and too expensive. No thank you.
    For that price ( or way less ) I would go for a small pistol with magazines. A Keltec, a Taurus, a Kahr, a CZ … choice is large fortunately and options are many.

  • Non Evil Twin

    Most morgue people confirm that a .45 bullet achieves the desired result with less attempts than lower calibres. A 200+ grain bullet will push through bone without deflection and do more damage on the way.

    Having a lightweight, compact missile launcher in your pocket could make the difference. You might even forget it's there. For the price, not a bad choice. You just have to shoot straight.

  • jtltetmt

    There's no way I would pay that much for that gun. If I wanted a small .45, I would much rather have the XDs, plus it is cheaper and more manageable.

    • Bill

      The XDs is a turd. I had one for a week, and shot about 90 rounds through it. Of those 90, about 12 FTF's, with light primer strikes…. Not just one type of Ammo, but 3: Winchester PDX1, Remington UMC, and Wolf.

      I took it back to the dealer, and got a full refund.

      The gun also shot about 3 inches left at 7 yards.

      Take my advice, stay away from the XDS until they rework it. Just so you know I have no beefs with Springfield, I also have the XD40/Subcompact, and that gun works flawlessly, with everything I've fed it.

  • Charles

    Nice innovative gun. To bad it costs twice as much as a sub compact.

  • Wolvie

    I don't know…

    I hate to sound negative about a new gun or design. But, I just can't get excited about this gun.

    To me, it's just a derringer-type gun. I don't really see the "innovation" beyond the fact that it might have a nice trigger or they decided to make a model out of super-expensive material. I kind of feel like someone is trying to tell me how much value there is by putting high-performance tires and high-intensity lights on a Vespa.

    But hey, if it turns out to be a quality piece and people get excited about it and buy one, I guess that's a good thing.

  • Tj

    what would i have to do to get one

  • John

    Worst handgun since the double barrle 1911.

  • Philip

    OK, I'll ask the obvious question: why does is fire from the top barrel first? That has to contribute significantly to muzzle flip. Every over-under shotgun I've ever used fired the lower barrel first, to rprovide dtraight-line recoil and, thus, reduce muzzle rise and speed target acquisition for the second shot.

  • MFF

    Very expensive paper weight toy.

  • Robert Easton

    I ordered a 9 MM double Tap from Collectors Firearms, Houston, Texas on January 4, 2012. For 10 months I have tried to contact Heizer-NO answer !!!!!!!!!! Are they still in business? Will they ever produce the gun?
    Bob Easton

  • Hujujuju

    If it cost $150 I may buy one…


    They have a sense of humor…note te mfg address as St Louis, MO, USA, Earth.

  • greggebhardt

    I will be buying one today!

  • badgerknox

    am I crazy? is $500 for 2 shots worth it? I have a keltek which I bought for $250 that will hold 7 .32s. I think the new ones hold 380s. Plus my gun is lighter and I have had it for 12 years, most of that time in my pocket, and never had a problem with it. I’d love the extra power of the 9mm, but not at twice what I paid and 1/3 the capacity.

    • Rick Schubert

      You are not crazy. While I agree that in a last-ditch situation two shots are a helluva lot better than no shots at all, $500 is unreasonable considering what you are getting with this gun.

      • lenny

        Yes it is unreasonable. You can get an XDs in ,45 or 9mm for similar price. I have a Sig P938 9mm that weighs in at 17 oz. and carries 6 or 7 +1. Too thin is no good because the recoil is concentrated in a small section of your hand instead of being spread around. And quite frankly there is not much difference between .9″ and 1.1″. It will make no difference in how the gun carries. I have lots of pocket guns, all lighter than this gun and they hold more ammo and have sights. This is a toy or for someone playing James Bond as for the money and calibers you can find much better. Try to find a shooting video of this gun that has something nicet o say about its quality or ease of shooting.

    • Alfred Flanagin

      yeah but the difference in getting hit with a .380 vs a .45 is wirth it. your assailant might nkt feel a .380 but the .45 will knock him out his shoes. I own a p3at(the .380 kel-tec) love it for how slim it is and easy to carry, plus any issue I have had with it kel-tec has been happy to fix for me. but I would prefer a larger caliber even if it is for just two shots

      • Jumal

        Saying that a .45 will knock someone out of their shoes shows a lack of knowledge of physics and ballistics. This is the problem with then new crop of shooters who believe that a large caliber out of any sized gun is as good as smaller one from a larger sized gun. I prefer my 11 oz/ .357 snub nose and5 shoot mini revolver in .22 magnum. If you think that you will have time to reload this gun in a gunfight, it means that you were never in a gun fight. :)

        • Alfred Flanagin

          And saying that a .22 magnum is gonna stop a full grown man showes that you have probably never been shot center mass. I would take 2 shots .45acp over 5 from a .22. Don’t get me wrong .22 shot well is an incredibly lethal round. Problem is it will bounce around inside of someone for long enough for them to finish you off before it ends them

        • Alfred Flanagin

          And I believe you are the one who doesn’t understand basic physics. If you look at the kinetic energy of a .45acp compared to that of a .22mag you would clearly see that a .22mag will have nowhere close to the same energy transfer as a .45. The .357 and .45 are quite close as far as kinetic energy is concerened once you consider different ballistics. But the higher energy .357 have a fmj so at that muzzle velocity you have a much higher chance of a clean in and out. Yet again not getting the same stopping power of a .45acp. And I do understand that a longer barrel will increase muzzle pressure. I GET PHYSICS. But if you consider a gun like this is ment to be a last ditch effort clearly you arent familiar with the concept that if you are reaching for a gun like this you aren’t going to have time to get off more than 3 shots anyway.

          • nate98

            they sell 357 mag in hollow points and the 357 outshines the 45acp in every way. more kinetic energy, higher velocity and look up the recorded statistics showing that the 357 mag has the highest One-shot kill ratio out of any other handgun in history. Facts not opinion

        • Chaz

          gotta go with Al on that.

    • Guest

      I remember one time while hiking with my girlfriend in northern Alberta and out of nowhere came this huge brown bear charging us, and was she mad. We must’ve been near one of her cubs. Anyway, if I had not had my little Heizer Double Tap I would not be here today.

      Just one shot to my girlfriends knee cap was all it took….. The bear got her and I was able to escape by just walking at a brisk pace.

      It’s one of the best pistols in my collection.

  • clarkwgriswold

    Hmmmm… Neat idea, but not going to buy when I can get 6 shots of .380 in a proven platform for less money.

  • Ernie

    My friend bought a new “double tap” and we went out to try it out. He fired it a few times, reloaded it and I tried it. I squeezed the trigger and received a horrible jolt with much blood. The pistol was covered with blood and we found it had “doubled” (both barrels fired as one). I have several stiches and it will be awhile before I can shoot any handgun because of the nasty gash from the recoil. You couldn’t pay me enough to fire one of those pistols again. whether it is a design problem or a quality problem, I don’t know but I doubt I will be the only one to experience this serious and painful malfunction.

    • smok n joe

      how can both barrels fire at the same time when the firing pin rotates on the pulling of the trigger ?

      • Will Pilot

        Because he is a liar

  • Justin

    Total junk. I wouldn’t own one if they gave it to me. This company doesn’t even respond to emails or attempts to contact them. Do you really think they are gonna be around when this tinker toy breaks and you need a repair? For less money you can get a much better gun. Period.

  • experienced

    I purchased both models,1 in 45,1 in 9mm, I would not recommend this firearm for any use ! very poor design ,malfunctions, more than a handful to control , and way overpriced.experienced

  • BarbarianPrincess

    I wonder if it’ll shoot .410 shot also in the .45 caliber? .410 up top, make sure with the .45 in the bottom?

    • MichaelZWilliamson

      Since .45 Colt is more powerful than .410, why would you bother with the .410?

  • John Smith

    I remember one time while hiking with my girlfriend in northern Alberta and out of nowhere came this huge brown bear charging us, and was she mad. We must’ve been near one of her cubs. Anyway, if I had not had my little Heizer Double Tap I would not be here today.

    Just one shot to my girlfriends knee cap was all it took….. The bear got her and I was able to escape by just walking at a brisk pace.

    It’s one of the best pistols in my collection by far.

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