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The 'Micro' K9
This petite 9mm is a cut-down version of the already small K9
Handguns p.56~62
May. 1998
By Duane Thomas

The Scalloped ejection port of the MK9 is necessary to permite ejection of complete unfired cartridges, as when unloading the pistol.
Before we get deeply into a test and evaluation of the auto pistol that is the topic of this article, the new Kahr MK9, we need to review a bit of the history of the gun from which it is descended, the Kahr K9. Several years ago, a new gunmaking firm by the name of Kahr Arms introduced a sidearm called the K9. The Kahr K9 was really something new and special on the handgunning scene, a full-power 9mm of a size more normally associated with .380 "pocket guns." However, unlike earlier abortive attempts at this type of gun, such as the old Detonics Pocket Nine, the K9 actually worked!

When a new company with no previous experience in firearms manufacture makes the scene with a radical new design, we are given to pause: Visions of Bren Ten dance in one's head, don't they? Will the company still be in business next year? Will parts, spare magazines and technical and warranty services still be available? Or will the company quickly fold its tent and slink into the night, leaving many folks with "orphan" guns? With a few years behind us now, we know the answers to those questions. Both the Kahr K9 and the company making it are standing the test of longevity. Not only is the K9 proving to be a very successful handgun, it's provided the basis for several interesting variants. One of the these is the Kahr MK9.

The closet competitor and counterpart to the MK9 is probably the Glock 26. The MK9 is considerably smaller than the Glock in every dimension except height.
The MK9 is in essence a "chopped" K9, with the barrel, slide, butt and magazine all shortened for greater compactness. I know, I had the same reaction: The original K9 was a tiny 9mm, and now they've made it smaller? Ye gods! Kind of reminds me of the old limbo dance song "How low con you go?"

The "MK" in this gun's designation, by the way, does not stand for "Mark" as we're used to seeing in Colt handguns, I.e., "MK IV Series 80." When I first took this gun out of the black plastic Kahr Arms box and saw "MK9" on its slide and barrel (the barrel is three inches long and features polygonal rifling) and also a half inch shorter in the butt. The magazine has, of course, been proportionally truncated as well. The MK9's shortly single-column mag holds six rounds of 9mm Parabellum, vs. Seven in the normal K9. Full-length, seven-round K9 magazines will work in the MK9, though they do protrude a bit. The MK9's stubby butt requires a shooter to use the "two-finger grip." with the little finger curled under the gun butt necessary on many of the new breed of concealment-oriented mini-guns.
To make the gun work with its extremely short slide, the MK9 uses a double recoil spring system, consisting of two guide rods and two springs articulating in and around each other. This is a very similar set-up to that seen on some other ultra-compact full-power autos, such as the mini Glocks and the Para-Ordnance P10. It requires about 17 pounds of pressure to pull the slide to the rear to the MK9, vs. 20 on the standard K9. (The very first K9s had 24-pound recoil springs and just about required you to throw your shoulder out of joint to hand cycle the action, for the historically minded among you.)

This back-to -back comparison makes apparent the difference in size between the MK9 and its parent pistol.
The seven-round magazine of the K9 will work in the Micro K9. The amount of magazine protrusion shows how much the butt has been shortened.
You might notice the ejection port on the MK9 has a "custom" looking scallop at front. That's because the ejection port itself is about 20 percent smaller on the Micro K9 than on the standard gun. In order to still be able to eject a live round, it was necessary to scallop out the ejection port in front.

On the original K9 design, the slide stop is held in the gun by a spring inside the right side of the frame that fits into a notch in the slider stop. In order to push out the slide stop to field strip a K9, it is necessary to hold the slide to the rear against the power of a very heavy recoil spring and then tap out the slide stop against the resistance of the retaining spring is on the left side of the gun and does not hold the slide stop in place nearly as tightly. There are witness marks on the left side of the holding the slide in this position (which is easy to do because of the lighter recoil spring), you can simply push out the slide stop with your fingers.

The most impressive thing about the MK9 is, of course, its size. The original K9 was shockingly small for a gun firing a full-power service auto pistol cartridge. The MK9 is considerably smaller than that. The reason Kahr Arms was able to chop the basic K9 design down this much and still have a gun that works is that they started out with a small gun. When I wrote my article on the first K9s to appear, I asked the folks at Kahr Arms just how they could design a 9mm that small. The reply: "Most gun companies, when they set out to produce a compact handgun, simply cut down an already-existing design. This severely limits their options, because basically you wind up with a bunch of people sitting around a table staring at a big gun, trying to figure out how to make it smaller. We, on the other hand, were not bound by what had come before. The K9 was designed from the ground up to be small."

When the K9 first appeared, it was really in a class all its own- size- and weight-wise-for a successful and reliable gun in a service caliber. It was the first truly small, full-power concealment auto pistol that actually worked. Since then, I get the feeling Kahr Arms has been feeling the competition in the weapons class it popularized, as other makers came out with their own 9mm mini-guns, such as Glock with its popular Model 26. Though a chunky gun like the G26 was a bit blockier and wider than the svelte K9, its overall size was close enough not to matter to many purchasers. Obviously, from Kahr Arms' viewpoint, something needed to be done about that sorry state of affairs.

The little Kahr is considerably flatter than the mini-Glock. The latter pistol is as wide as a full-column Glock service auto.
The MK9's truncated single-column magazines hold six 9mm Parabellum cartridges.
The new Kahr Micro K9 is a "chopped" version of the already small K9. The slide, barrel, butt and magazine are all shortened for greater concealability.
To check the functionality of the MK9 with quality reloads, author Thomas fired the MK9 with both Black Hills "blue box" commercial reloads and his own handloads featuring the Hornady 115-grain FMJ/RN.
So now we've gotten to the point of the Kahr K9 designers sitting around a table looking at their gun trying to figure out how to make it smaller. However, since they began with a small gun, when Kahr Arms began downsizing the K9, the design staff was able to make it a lot smaller than the guys chopping on gun designs that were initially a hell of a lot bigger than theirs. Basically Kahr Arms said, "Okay, we started out with a radically small 9mm, and other makers responded by cutting their basic design down so small their guns were close in size to ours. Well, they can't chop their design down any smaller and still have a functional handgun. We can. Let's see ‘em match this!"

The Kahr MK9 is 51/2 inches long and four inches tall; it's approximately 0.9 inch in width through the slide. According to ye olde postal scale, an empty MK9 weighs 23.8 ounces; fully loaded with seven rounds of 115 grain 9mm hollowpoints it goes 26.7 ounces.

The gun everyone'll want to compare the MK9 to will naturally be the Glock 26. According to Glock literature, the G26 is 6.29 inches long (they're very into hundredths of an inch in Glock land). That's almost 4/5 inch longer than the MK9. G26 is 4.17 inches in height-marginally taller than the MK9. Perhaps most telling of all, the G26's slide is 1.18 inches wide, the same width as a service-sized Glock 17 and more than a quarter inch wider than the MK9. Weight-wise the mini-Glock Nine tips the scales at 21.7 ounces empty, 26.2 ounces stuffed with II rounds. So the MK9 is within half an ounce of the G26 in loaded weight. Such a minuscule difference is a non -issue. The G26 does hold four more cartridges; however, it is also considerably larger than the MK9 in almost every dimension except height. You pays your money and you makes your choice.

My first MK9 sample gun to be returned to Kahr Arms for a bad extractor. Tension on this gun's extractor was so high that I couldn't make it through a single six-round magazine without having several failures to go fully into battery. Kahr Arms had a replacement gun in my hands within days. With the second gun, it was the difference between night and day.

I repaired to the range to break in the piece with some hardball. Since the entire K9 series are finely fitted all-steel guns, Kahr Arms recommends you fire 200 rounds of ball to smooth things out and seat the parts before venturing into the realm of hollowpoints. I started out with some Speer 115-grain FMJs; I fired 87 rounds of this stuff. After that I was really curious to see how the MK9 would handle some reloads. Kahr Arms literature cautions against using reloaded ammunition in their guns. Since Kahr Arms guns in general feature rather tight chambers, unless reloads have been perfectly resized, the action won't snap shut around them. I fired 50 rounds of Black Hills 124-grain FMJ "blue box" stuff, which are very high-quality factory reloads, and the gun digested them perfectly. Then it was home to clean the gun before my next range session, at which, 46 rounds of my own reloads, consisting of the Hornady 115-grain FMJ/RN over 4.2 grains of W231, met their appointments with destiny. So far, so good.

By then I figured I was just about through the break-in period, so it was into the realm of hollowpoints. I function-fired the MK9 with a reasonably diverse assortment of 9mm Parabellum ammunition, II loads in all, including eight standard-pressure JHPs and three extra-high-pressure +P and +P+ loads. Contrary to what you might expect in a gun this small, the MK9 is rated for +P and +P+ ammo, just like the earlier K9. However, the folks at Kahr Arms ain't gonna tell you the Micro will stand up to the same amount of pedal-to-the-metal stuff as the standard K9!

Test ammunition included the following standard-pressure loads: Federal's classic "9BP" 115-grain JHP, Hornady JHP-XTPs in both 115-and 124-grain weights, Remington's 115-grain JHP, Speer Gold Dot-HPs of 115, 124 and 147 grains and Winchester's 115-grain Silvertip-HP. Hot stuff on hand consisted of Cor-Bon's 125-grain JHP +P, Federal's 115 grain JHP +P+ product code "9BPLE" and the same firm’s 124-grain Hydra Shok-JHP +P+.

In order to get some idea of the gun's accuracy potential at reasonably close range, I fired five-shot, five-yard groups from a standing unsupported two-handed shooting stance. Accuracy was surprisingly good. Best groupability, amazingly enough, was with the hot Cor-Bon +Ps, which put five rounds through one ragged hole measuring 5/8 inch center to center. Marginally larger at 11/16 inch were the Hornady 124-grain JHP XTPs. And again just slightly larger was the 3/4-inch cluster with Federal's 124-grain +P+ Hydra Shoks. Most groups were somewhat looser than this, but in no case did they stray over two inches.

Shooting sub-inch groups at five yards with the MK9 proved no great challenge for author Thomas. At 50 feet from a rest, the best accuracy achieved with the MK9 was this two-inch group fired with Remington 115-grain JHPs.


For accuracy work from the bench, 50 feet was the maximum distance possible at the indoor range on which I was shooting, and, in any event, I felt the traditional 25 yards might be a bit much for a gun of this type... So 50 feet it was! Best accuracy here came from Remington's 115-grain JHP with a group of two inches even. With the Federal 9BPs, it was 29/16 inches, and the Federal 124-grain Hydra Shok +P+ was right in there with a group of 211/16 inches. Most of the rest of the ammo fell into the three- to four -inch range, which at 50 feet is, as the old cliche goes, "perfectly combat adequate" but not much good for anything else. But come to think of it, the Kahr Micro K9 isn't built for anything else, is it?

When examining fired cases, I did notice that I was getting serious primer smears with the MK9. This occurs when there is still pressure inside the cartridge casing, and the firing pin is still in contact with the primer, while the action is starting to unlock. This is generally seen as a sign you're firing a round too powerful for the gun containing it. With the hot +P and +P+ stuff, primer smears went almost totally off the primer and into the brass! However, I'm seeing this sort of thing on all the new breed of service caliber sub-compacts, so you can hardly single out the MK9 for criticism in this regard.

Oh, by the way, in case I forgot to mention it, the MK9 worked perfectly with everything I put through it. About the only negative comment I can make regarding the gun's functionality is that, when firing it with a straight thumb grip, if the thumb touched the slide stop even lightly during recoil, the action would fail to lock open on an empty magazine. Even when slowly hand cycling the action, the slide often wouldn't lock to the rear on an empty magazine. It didn't matter which of the two six round magazines supplied with the gun I used, the results were the same. This only happened once when firing the gun with a locked-down, thumb over-thumb hold, and that was with generates some pretty impressive slide velocity.

The sheet metal follower in the MK9 magazine proved less reliable in locking the empty gun open than the plastic follower/metal stud arrangement in the earlier K9 magazine.
These failures to lock open when empty occurred only with the shorty six-round MK9 mags and never with the seven-round K9ers. The follower in the MK9 magazine is formed from thin sheet metal (to save room and allow the magazine to be as short as it is, I'm sure) and it doesn't do nearly as good a job of engaging the slide stop as the thick plastic follower/metal stud arrangement in the standard K9 magazine. Of course, we might also ponder the fact that this is not the sort of gun for which one carries around spare magazines in a belt pouch for those lightnin' fast speed reloads. It is rather the sort of gun you drop into your front pants pocket and forget about.

To start with, I didn't really care for the two-finger grip necessitated by the MK9's ultra-chopped butt. I'm not usually recoil sensitive, but I must confess the little MK9's backbite seemed at first to me, not exactly heavy, but hard to control because of the short grip, especially compared to the standard K9, which is astonishingly easy to control for its small size. As my shooting progressed, however, I found the little piece coming under control surprisingly swiftly. With only minimal familiarization. I was able to fire double taps from the MK9 with two good hits on a paper plate circa four yards in .30 second shot-to-shot. The MK9 is not a gun I'd recommend for a novice shooter; however, with practice, I believer it can be brought under control.

As with all new guns, it will be awhile before most major holster manufacturers come on line with scabbards for the MK9. One maker that has gotten the jump on the competition is DeSantis. I was sent two DeSantis holsters for the MK9 to examine. One of these is a rendition of the familiar DeSantis Speed Scabbard, a pancake-style holster, built around the MK9. The other is an inside-the-waistband design called (and I think this is the cleverest name for a holster I've heard in a loooong time) the "Inner Piece."

In summary, obviously what will attract most Kahr Micro K9 purchasers to this gun is its minuscule size envelope for a gun chambering a service caliber. I mean this thing is small. We're not quite down to the size of an AMT .380 Backup here... But we're gettin' there! The Kahr MK9 carries seven shots of full-strength 9mm Parabellum ammunition in a size package heretofore unheard of for a gun of its power. My sample piece worked perfectly with every make and model of defense-type hollowpoint I put through it, including the ultra-hot, extra-pressure, super-high velocity stuff. This is damn impressive. That Kahr could build a 9mm this tiny is really not that amazing-the amazing thing is they've built a 9mm this tiny that works!

DeSantis is already making holsters for the MK9, including a version of this firm's popular Speed Scabbard and the "Inner Piece" inside holster.

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