AR-15 Takedown Systems: Folding Front-End Firepower

By Nancy McCoy April 19, 2024 10 mins read 330 Views

Many worship at the altar of Stoner, exalting the AR-15 platform’s ergonomics, versatility, and modularity. But with a receiver extension and buttstock that can’t be folded, since the bolt carrier group reciprocates into it, compactness for transport wasn’t Stoner’s first priority. The aftermarket has come up with solutions for this — but what if you’re looking for an even smaller footprint than a folding stock will provide? That's where the AR-15 Takedown comes in.

If you don’t mind disassembling your weapon, Stoner’s original design gets you halfway there, as you can easily detach the upper and lower into two pieces. However, it’s fiddly and not the quickest to deploy, and you’re still constrained by the length of the entire upper assembly, essentially the barrel plus the upper receiver — which itself accounts for about 8 inches of length.

Since the barrel is typically the longest component on an AR, several companies have come up with take-down systems to quickly detach and reattach the barrel and handguard assembly from the upper receiver. Combine this with a folding or PDW-style stock or brace, and you’ll have the shortest overall footprint short of sawing your barrel in half (we don’t recommend this unless you’re a hapless virtue-
signaling congressional candidate). Something to keep in mind is that systems like this may have some zero shift, though none tested were terribly noteworthy due to the short-range requirements typical of a hideaway rifle.

In this article, we look at take-down offerings from Cry Havoc Tactical, FoldAR, LEO TakeDown, and Pantheon Arms.

Cry Havoc Tactical

If you’re seeking a take-down system that’s currently fielded by the U.S. military, look no further than Cry Havoc Tactical’s offering. Their QRB system is used in the U.S. Air Force’s GAU-5A Aircrew Self Defense Weapon, custom built by the Air Force Gunsmith Shop to equip aircrews with a 5.56mm carbine that can be broken down and stowed in the tight confines of an ACES II ejection seat. Packaged with four 30-round magazines, the reconstituted rifle provides a downed pilot with far more firepower than the 9mm M-9 pistol that it replaced.

Cry Havoc Tactical AR15 QRB Kit 2-Pin Military Model

Cry Havoc’s system utilizes two tensioning levers that secure the barrel assembly to the upper receiver. The receiver plate attaches to the upper with a star nut, retained by a set screw that sits in one of the nut’s grooves to prevent it from rotating. The barrel plate keeps the barrel firmly captured with three set screws and has standard threading on the muzzle side to attach the barrel nut for your handguard of choice. A clever two-piece gas tube arrangement solves the problem of the otherwise-vulnerable standard AR gas tube, with a shortened gas tube attached to the gas block slotting into an extension in the QRB’s receiver plate that feeds gas back to the bolt carrier group.

Slide the barrel extension into its home on the upper receiver and hooks on the levers on the barrel plate grab on to slots in the receiver plate, snapping down to lock into place. Two stout locator pins ensure you line everything up properly and also further protect the gas tube. To tear down your gun, lock back the bolt, flip open the levers, push them backward if you need help unseating the barrel from the upper, make sure the hooks are free, and yank out the barrel/handguard assembly.

AR 15 Parts.

You can use a wide variety of handguards; they just need to be slim enough to leave room behind the locking levers to get enough purchase to open them. There are recesses on the barrel plate to accept small anti-rotation tabs. Note that due to the beefy barrel plate, you’ll need to use a handguard that’s 1.5 inches shorter than you would otherwise. If you want a complete upper with the Cry Havoc system, their sister company, Weaponstech Engineering, offers a variety of configurations, including one-stamp suppressed uppers.

Ar-15 parts.

For our build shown here, we wanted to create our own, even smaller version of the GAU-5A — and in .300BLK as befits such a small gun. To match the GAU-5A, we used a Midwest Industries 4.5-inch M-LOK Combat Rail (effectively becoming a 6-inch rail with the QRB barrel plate) along with one of their upper receivers. The latest MI handguards have large anti-rotation tabs, unlike those used by the Air Force, so we cut them down to fit with an end mill and files, then hit it with Alumablack.

Instead of a 12.5-inch 5.56mm barrel, we fitted a 7.5-inch Faxon gunner profile barrel in .300BLK along with one of their gas blocks, topped off with a Midwest Industries muzzle device. The assembled upper went on one of our pistol lowers, equipped with a LAW Tactical folding stock adapter and the same FAB Defense folding pistol grip seen on the GAU-5A. The resulting package is insanely compact when broken down.

Ar-15 parts.

We were very impressed with the Cry Havoc take-down system, in particular the consistent locking levers, the two-piece gas tube and locator pins, the ability to use a variety of handguards, and its overall robustness.

Make: Cry Havoc Tactical
Model: AR15 QRB Kit 2-Pin Military Model
MSRP: $425 with pistol, carbine, or mid-length gas tube; $435 with rifle-length gas tube
URL: cryhavoctac.com

FoldAR

Available as a complete double-folding rifle or pistol as well as a proprietary upper receiver unit, the FoldAR is a seriously small unit. The Double FoldAR pistol seen here breaks down into a tiny package of a mere 10.75 by 5.75 inches, perfect to fit into a lunch box-sized bag — exactly like the one that comes with it.

The FoldAR is a complete system, not a conversion, as it uses a proprietary upper receiver, handguard assembly, and adjustable gas block. True to its name, the FoldAR is a hinged system with a lever latching system integrated into the right side of the M-LOK handguard for takedown. Folding the barrel assembly first requires you to lock the bolt to the rear and then pull the SHUT lever outward to unlock the barrel. The barrel now can be folded along the hinge, closely hugging the left side of the upper receiver. FoldAR includes a convenient pull tab on the lever for an assist, though it can be removed if that idea makes you squirrelly. However, they added it for a reason, as it’s not easy to open without it.

Profile studio photos of an ar-15.

To deploy the FoldAR’s barrel, swing the barrel assembly forward until it clicks in place. Note that because the barrel swings into place rather than sliding straight into the upper receiver, the custom barrel extension is beveled. Then, pull and release the SHUT lever to ensure the lock is properly engaged. At that point, the bolt can be released, and you’re ready to go. While you lose the flexibility of arranging the broken-down pieces however you’d like, it’s handy to have a single unit that folds open.

For the folding stock on the complete double-folding rifles and pistols, FoldAR uses a Dead Foot Arms MCS adapter, whose standout feature is the ability to fire and cycle the weapon with the stock/brace folded. If purchased outright, this system would require modification of your bolt carrier group, but since FoldAR produces complete weapons they do the work for you. Instead of a typical BCG, FoldAR ships with a four-position gas-adjusting carrier from Bootleg Inc. All of these custom, proprietary parts results in a hefty price tag, but it avoids the requirement of having the requisite skills and tools of an armorer.

Profile studio photos of a folded ar-15.

On our example, we added a SIG Romeo optic, Magpul AFG, folding offset sights, and a muzzle brake/silencer mount made by Elite Iron for their War Dog can. When not going suppressed, a sleeve fits over the brake to convert it to a linear compensator.

Rifles, pistols, and upper assemblies from FoldAR are available in 5.56mm or .300BLK in barrel lengths of 9, 10.5, and 12 inches.

Make: FoldAR
Model: Double FoldAR Pistol (complete)
MSRP: $2,399
Model: FoldAR Upper Assembly (complete)
MSRP: $1,599 to $2,199
URL: foldar.com

LEO TakeDown

LEO TakeDown doesn’t offer a folding system but instead the ability to quickly detach and remove your barrel and handguard assembly from the upper receiver. Available as conversion parts or in a limited selection of complete uppers, the LEO TakeDown system reminds us of quick connect couplers that attach the hose from your air compressor to a pneumatic tool.

Studio photo of an AR-15.

To remove the barrel assembly, first retract or lock the bolt to the rear. Then, rotate the circular locking nut to the marked “unlock” position and pull it back. The spring-loaded assembly retracts locking bearings, and the entire barrel and handguard can be pulled out from the front. There are storage covers for both the barrel assembly and upper receiver to keep crud out if they’re stored in two pieces, and importantly they protect the now-exposed, relatively fragile gas tube from damage.