Browning BAR Mk 4 DBM Hunter: Full Review

The Browning Automatic Rifle Mk 4 lives up to the household name. Here's a full review.

January 30, 2026 By Tom Beckstrand

The Browning Automatic Rifle (BAR) was one of John Moses Browning’s most iconic designs. It was a hurried affair that took him three months to complete prior to fielding for World War I. John’s son, Val, was a lieutenant in the U.S. Army and was responsible for training new troops on the function and use of the new rifle. The Army named it the “BAR M1918,” and it and the variants stayed in use with the U.S. military until the Vietnam War. The M1918 is an air-cooled automatic rifle that fires from an open bolt with a cyclic rate of 330 to 550 rounds per minute (rpm), which is easier to control. My wife’s grandfather carried one in World War II. He told me that it was completely reliable, if a little heavy for his liking.

The new BAR Mk 4 is a completely different rifle. Interestingly, it was designed by John Browning’s grandson, Bruce Browning. Bruce was Val’s son, and these three gentlemen put the “B” in the “BAR.” I’ve not heard of another family being so heavily tied to a rifle. While Bruce is credited with designing the BAR, he also invented the Browning Medalist rimfire pistol and moved the T-Bolt rimfire rifle from a science project to production.

gaad-bro-barmk4-02 — Introduced in 2025, the Browning Automatic Rifle (BAR) Mk 4 is a gas-piston-operated semiautomatic rifle that feeds from a detachable box magazine. The next generation version of the BAR supports popular short-action cartridges and long-action magnums. (Photo by Mark Fingar)

Magnum Capable

The only thing the new BAR shares with its predecessor is the name. Bruce Browning and a team of Belgian engineers started work on the BAR in 1966. What resulted was a gas-piston-operated semiautomatic rifle that Browning could chamber in anything from .243 Winchester to .338 Winchester Magnum. Sadly, the .338 Winchester Magnum chambering is no longer available, so the .300 Winchester Magnum is the most powerful offering.

The BAR was no small engineering feat. The difference in the amount of gas and bolt thrust generated by a .243 Winchester compared to a .300 Winchester Magnum is considerable. The BAR had to be forgiving of different pressures. Allow me to indulge in a bit of rifle nerdery as we compare just how difficult it was to accommodate both a .243 Winchester and a .300 Winchester Magnum in a semiautomatic rifle.

gaad-bro-barmk4-03 — With the bolt retracted and lower assembly removed, the steel bolt lug abutments in the receiver and barrel can be accessed. (Photo by Mark Fingar)

The Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) lists the maximum allowable chamber pressure in a .243 Winchester as 60,000 pounds per square inch (psi). A .300 Winchester Magnum is allowed 64,000 psi. When you combine the higher pressure of the .300 Winchester Magnum with the larger case head diameter, there is a huge difference in how much each of those cartridges presses against the bolt face, i.e., “bolt thrust.” The bolt in the BAR is strong enough to handle the magnum-level thrust, and the piston operation is forgiving enough to work reliably with significant differences in gas volume. I know of no other semiautomatic rifle that can make these claims.

The rifle is as simple as it is durable. With the forend and stock removed from the receiver, the gas piston and operating rod are found located underneath the handguard. A quick twist of a wrench allows the gas piston to be removed, after which the operating rod and recoil spring can separate from the barreled receiver. The rest of the BAR can be disassembled in detail with some dexterity, a pick, and a little know-how.

gaad-bro-barmk4-04 — The composite forend shrouds the gas-piston operating rods, coil springs, and action bars that provide the BAR its smooth operation. (Photo by Mark Fingar)

From a maintenance perspective, the BAR is a dream. With a handful of the most basic tools, the owner can perform a detailed disassembly of the rifle for inspection and basic maintenance.

Evolution

While many of Browning’s firearms are manufactured in Japan, the BAR was never built there. Bruce and the team created the first BAR rifles in Belgium, and then production shifted to Portugal during the early 1970s. It has remained there ever since. The reason production never moved to Japan is due to Article 9 of the Japanese Constitution, which forbids the country from maintaining a military with an offensive capability. Evidently, that prohibition of an “offensive” capability extends to the production of semiautomatic and automatic firearms. The Browning Viana factory in S. Romão de Neiva, Viaa do Castelo, Portugal, has been operating since April 12, 1973. It would take a compelling reason to move production, even if laws changed.

gaad-bro-barmk4-05 — The gas-piston system is reliable, bleeding pressure at the forend and minimizing carbon fouling in the chamber and receiver. (Photo by Mark Fingar)

The BAR went through a handful of iterations since its inception in 1966. The rifle experienced few changes until the Mk II version was introduced in 1993. The BAR Mk II received a new trigger group featuring two cross pins for easier disassembly and the inclusion of a separate slide-stop to allow the bolt to be locked open with or without a magazine. The Mk II was also tested with a detachable box magazine, but that design change was never put into production. The Mk III — sometimes labeled “Mk 3” — was introduced in 2016, which ushered in a new aluminum alloy receiver and stock design, as well as an improved short-stroke gas piston system and rotary bolt. The detachable box magazine version was also an option on the Mk III.

The Mk 4 features some evolutionary changes from previous models. The biggest change is the move from a clamped-fit barrel to a barrel that threads into the receiver, like most other rifles have. There was a debate between rifle engineers about which barrel and receiver connection offered the best accuracy. After extensive testing, Browning determined that it could get better accuracy with the threaded receiver and barrel connection.

gaad-bro-barmk4-06 — Separating the trigger assembly and magazine well from the BAR Mk 4 involves removal of notched crosspins and two fasteners. (Photo by Mark Fingar)

Browning’s findings mirror those of other manufacturers. A tightly torqued, threaded barrel offers the ideal accuracy under most circumstances. Since the BAR has a short-stroke gas-piston operating system, I’m not surprised the increased contact that comes from a lengthy threaded tenon into the receiver yields the best results. Semiautomatic rifles and their reciprocating mass can raise hell between the barrel (to which the gas system is attached), and the receiver that must keep it from moving around. The accuracy improvement Browning saw with this engineering change was substantial.

Other changes to the Mk 4 include cosmetics with the stock to reflect shooter preferences today and the addition of a model featuring the long-awaited detachable box magazine. Guns & Ammo was fortunate to test this version. The detachable box magazine carries a double-stack ammunition column that feeds effortlessly into the chamber. The addition of the new magazine was an excellent idea because it combines easy reloads with a simple and robust rifle that is great for follow-up shots.

For me, testing the BAR Mk 4 included range sessions and a black bear hunt in Idaho. The takeaway from all that shooting was that the BAR enjoys a cult following for a reason. The rifle exudes quality. At no point was there a functional hiccup. Disassembling the rifle also revealed just how easy it is to maintain. Unlike AR-pattern rifles, the BAR can chamber anything from short-action cartridges to the .300 Win. Mag. Magnum chamberings bring a lot of fast-shooting firepower unavailable anywhere else.

Shooting the BAR was pleasant. It isn’t so much a result of weight, since the test model scaled at 71/2 pounds. The semiautomatic operation bleeds a lot of felt recoil away from the shooter to cycle the action. While a 71/2-pound .308 Win. is never going to be known for its punishing recoil, the BAR Mk 4 is pleasant to shoot. I expect the magnum chamberings would be equally forgiving.

gaad-bro-barmk4-08 — The blued steel detachable box magazine holds 10 rounds of .308 Win. Spares are available at browning.com. (Photo by Mark Fingar)

I asked Browning about the potential for a suppressor-ready BAR. They haven’t looked closely at that option yet. It is unknown how the gas system would respond to a suppressor, but given how effectively the system already manages the gas, I bet it would suppress well.

The BAR has legacy and panache. While the modern BAR lacks combat experience, it maintains a reputation for simplicity and reliability. American riflemen seem to prefer bolt-action rifles, but the BAR makes a compelling argument for the sporting semiautomatic chambered in popular cartridges. It offers soft-shooting firepower with the fastest follow-up shots. Anyone facing down a herd of wild hogs or making fast shots in thick timber would be well-served with the BAR Mk 4.