KAK Industry K15 4.75″ AR-15 Pistol Review

KAK Industry K15 Pistol Specs & Features

Specs

• Caliber: 5.56mm
• Action: Semi-auto
• Capacity: 30+1 (per magazine)
• Length: 19.25"
• Barrel length: 4.75"
• Width: 2.4" (charging handle)
• Height: 7"
• Weight: 4 lbs.

Features

• 41V50 Button Rifled Barrel
• Forged Upper
• Micro-length Gas System
• Billet Lower

The AR pistol has been around a while now and most folks understand there is a trade-off between concealability and velocity. KAK Industry recently released a 4.75-inch barreled model that had me scratching my head.

I could see the attraction of an AR pistol you could tuck into a map pocket in your car, but it brought up more questions in my mind.

Would it be reliable? Would it be accurate? How much velocity would I lose in such a diminutive shooter? Absolutely needing to satisfy that curiosity, we got one in for testing.

We’ll share what we learned with you below, so read on to learn about the K15's specs, features, and, most importantly, how it did at the range.

KAK Industry K15 AR-15 Pistol, 4.75″

$674

at KAK Industry

Prices accurate at time of writing

$674

at KAK Industry

How We Tested KAK Industry K15 Pistol

For this review, we tested the KAK Industry AR-15 Pistol with an AT3 Tactical Alpha Red Dot, shooting 3-round groups at 25 yards, 10-round groups at 7 yards, and a 10-round group at 100 yards.

We used 500 rounds of ammunition, both practice ammo in the form of AAC 55gr FMJ and Speer Gold Dot 55gr defensive.

At the helm was Sean Curtis, who has been shooting since childhood but really began to delve into guns more during his law enforcement career of over two decades. He received continued training for his roles in SWAT and was a POST-certified handgun instructor.

Background

AR pistols have been around for several years now in various configurations. Their lengths varied but generally ranged in the 9-12 inch barrel category.

This is largely because the effectiveness of the relatively small 5.56 round is powered by velocity. Some folks wanted more maneuverability and concealability, so they traded some velocity for a smaller package.

KAK recently stepped up and said, “Hold my beer,” before releasing their 4.75-inch barreled AR pistol.

Who Is It For?

An AR pistol of this size is potentially an upgrade in firepower over pistol calibers. Its smaller footprint makes it much easier to stash in a backpack, behind a car seat, or anywhere in your home.

It could be used for personal defense and defense of the home. It's small size lends it to stashing in convenient places.

Ergonomics: Fit & Feel

The K15 has a standard AR finish, though it features a forged upper and billet lower with hard coat anodizing. The overall fitment is good, with nothing wiggling or rattling under a vigorous shake.

This pistol comes equipped with a standard A2-style grip and a removable trigger guard. KAK Industry saw fit to keep things tight with a 4.5-inch buffer tube sticking out the back.

There is no butt stock nor brace to consider on this pistol. Moving forward, you also don’t have much room on the forend. At roughly 4 inches long, there’s only room for two M-LOK slots.

While these are located at 2:00, 3:00, and 4:00, respectively, only the ones closest to the muzzle are useable. The set nearest the receiver is blocked by hardware for the barrel nut.

The real story here is that you would be hard-pressed to mount up any accessories and still get a grip on the rail. There just isn’t a lot of room.

With my large hands, I barely had enough space to get my whole hand on the forend. At one point, I even felt the dust cover pop open and hit my hand while the A2 birdcage roared away up front.

The upper Picatinny rail covers the top of the upper, but there are only 10 inches to work with. It’s ample for the application and allowed me to mount an AT3 Tactical Alpha Red Dot for the test.

I used a variety of magazines for the test, including Magpul, Colt, and KCI. All loaded securely, fed, locked back on the last round, and dropped when called upon to do so.

Controls

The controls are very familiar as standard AR-15. Fire control is left side only as is the bolt catch/release.

Magazine release is on the right side as you’d expect. Everything is pretty standard mil-spec though the charging handle features an enlarged left-side latch.

The trigger felt decidedly mil-spec, though perhaps lighter on the pull, averaging 3 lbs. 3.7 oz. on a Lyman Digital gauge. I noticed a tiny bit of creep before a solid break, though reset was immediate, very tactile, and very audible.

How Does the KAK Industry AR Pistol Shoot?

The manual of arms is different from the buffer tube only AR pistol and this leads to some loss of control on recoil. Even though the recoil is light, you just can’t snug it down like you can with the traditional four points of contact you enjoy with a rifle.

This creates a bit of a paradoxical wiggle when you shoot. The faster you shoot, the more pronounced. Follow up sight picture becomes the focus.

To test accuracy, we set up and zeroed with the Alpha Red Dot at 25 yards using a table and Ultimate Gun Vise from CTK Precision. I was encouraged by the averaged 1-inch groups we achieved using both Speer’s Gold Dot and AAC’s ammo.

Pushing out to 100 yards, I dialed down the brightness of the dot, centered it on the middle of the target, and sent ten downrange. Although some of my hits were off the printed target, I was surprised to see approximately 5-6 MOA from such a small barrel.

To further test normal pistol procedures, we lined up on the 7-yard line and fired 10 shots unsupported. Shooting at a medium pace, my shots were spread out around 3 inches.

While I was impressed with the accuracy, I realized the other part of the story would be the loss of velocity from the short barrel. We used a Garmin Xero C1 and shot several groups to average results.

In addition, we utilized a FoldAR rifle for a comparative base. Velocities for the 4.75-inch K15 averaged 1,700 FPS, while the FoldAR averaged 3,000 FPS.

Regarding reliability, it was a little dicey until we figured out what was going on. The pistol experienced a few failures to eject, which eventually led to a double feed.

After a few malfunctions, it became clear that the extractor on the bolt carrier group was bad, so we replaced it with another BCG. The pistol ran great after that.

Considering the short size of the barrel, buffer tube, and micro-length gas system, it’s pretty impressive that the KAK Industry AR Pistol runs so well.

Another noteworthy observation was the sound. The little gun is loud; anyone off to the side will feel the muzzle blast, thanks to the A2 birdcage. Additionally, you do get a tiny bit of gas to the face from the end of the buffer tube.

Why is the KAK Industry K15 Unique?

There are not many manufacturers making AR pistols with barrels this small. This application is an upgrade from pistol calibers with a package that is still somewhat concealable.

Compared with the FoldAR, it does not have the same accuracy or velocity. However, it doesn’t require assembly and is much more affordable.  

KAK Industry K15 AR-15 Pistol, 4.75″

$674

at KAK Industry

Prices accurate at time of writing

$674

at KAK Industry

Upgrades For KAK Industry 4.75u0022 K15

AAC 5.56 NATO 55gr

$10 at Palmetto State Armory

ShellShock Ultimate Eyes u0026 Ears Combo (Bluetooth)

$169 at ShellShock Protection

AT3 Tactical Alpha Red Dot

$119 at AT3 Tactical

Pew Pew Tactical Multicam Sling

$59 at TriStar Trading

Final Verdict

Considering this is a fairly specific use firearm, I was impressed with how it performed. Granted, there were issues at first, but once the bad extractor was diagnosed and replaced, it ran reliably.

The K15 is compact and accurate, doesn’t need to be assembled before use, and is comparatively affordable. If you want a very short AR pistol that is bang-ready in a bag, KAK Industry has a great option for you.

Just make sure your fingers are all the way on that rail!

Will you be picking up a KAK Industry K15 for your defensive needs? Let us know in the comments below. Be sure to check out the Best AR-15 Pistols of 2024 [Complete & Build List] for even more options!