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Vietnam’s Best Spec Ops Weapon? The Stoner 63 By Friedrich Seiltgen

The names of firearms designers such as John Moses Browning, Mikhail Kalashnikov and Eugene Morrison Stoner are synonymous with iconic firearms. Stoner was a prolific firearms designer who was responsible for the AR-7 U.S. Air Force survival rifle, the AR-10 rifle, the SR-25, and, of course, the AR-15 and M16 rifles.

US Navy SEAL with Stoner 63 in Vietnam War 1968
A member of a U.S. Navy SEAL team armed with a Stoner 63 uses caution as he watches for any movement in the thick wooded area along a stream. Image: U.S. Navy

Stoner was born in Gosport, Indiana, and eventually moved to Long Beach, California. Since there was no money for him for college during the Depression, he took a job at Vega Aircraft Company, the forerunner of the Lockheed Corporation, installing armament systems.

When World War II broke out, Stoner enlisted in the Marine Corps and became an Aviation Ordnance man, serving in China and the South Pacific.

After the war, Stoner began work at the Whitaker Aircraft Equipment Company as a machinist, rising to the position of design engineer.

In 1954, Stoner took a position as Chief Engineer with the ArmaLite Division of the Fairchild Engine and Airplane Corporation and developed several firearm prototypes, including the AR-7, the groundbreaking AR-10, and the AR-15 and M16 rifle.

A New Era

In the mid-50s, the U.S. Military was looking for a replacement for the M1 Garand, and Stoner submitted his AR-10 design. The AR-10 was extremely unconventional for its time, constructed using fiberglass and lightweight aluminum alloys, employing an eight-lug rotary bolt, and a direct gas impingement system.

Navy SEAL with Stoner 63 machine gun moves through mud in Vietnam
A Navy SEAL with a Mk 23 Model 0 machine gun, also known as the Stoner 63, moves through deep mud in Vietnam. Image: U.S. Navy

The patent for this gas-operated system was filed in 1956 for use in the AR-10, which was later developed into the AR-15 and M16 rifles. In U.S. patent 2,951,424, Stoner states: ″This invention is a true expanding gas system instead of the conventional impinging gas system.″

In 1956, the AR-10 competed against both the M14 rifle and the FAL rifle to replace the M1 Garand and lost, but Stoner’s gas system eventually went on to become the new standard with the AR-15/M-16 family of rifles.

In 1960, Colt Firearms purchased the rights to the AR design, and Stoner became a consultant. While there, Stoner conceived a modular rifle that could be configured with different subassemblies for the mission at hand. Stoner took the idea to defense contractor Cadillac Gage and brought with him Jim Sullivan and Bob Fremont, who had helped Stoner develop the AR-15.

Stoner 63 Modular Weapon System

The Stoner 63 Modular Weapons System was a unique concept that enabled the shooter to configure the rifle into several different weapon systems using a common multi-use receiver. Using interchangeable components, the long stroke piston-operated Stoner could be set up as six different and unique weapon systems. Also, the Stoner 63 used a stamped sheet metal receiver. It was a simple and robust weapon that could be produced affordably in large quantities.

US Navy SEALs move through the Mekong Delta armed with Stoner 63 machine gun
SEAL team members move toward an enemy bunker complex on Tan Dinh Island, during Operation Bold Dragon III in the Vietnam War. The SEAL in front, right is carrying a Stoner 63. Image: U.S. Navy

The first Stoner design was the Model 62 chambered in 7.62×51 NATO ammunition. Later in 1962, the Stoner was chambered in 5.56x45mm to reduce weight and was renamed the Stoner 63. Developed with military sales in mind, the Stoner 63 caught the interest of the U.S. Marine Corps and the Defense Advanced Research Projects Agency (DARPA). In August 1963, both were given a demonstration at Quantico, Virginia, and prototypes were ordered.

US Marines test the Stoner 63 rifle during the Vietnam War
U.S. Marines test the Stoner 63 rifle in 1967 during the Vietnam War. Some Marines referred to the gun as the “Johnny Seven” after a popular toy gun of the era. Image: U.S.M.C.

As noted, the Stoner Weapons System was designed with simplicity in mind. It uses sheet-metal stampings for ruggedness and reinforced plastic or wood buttstocks and forends. The basic component group could be mass-produced.

Any interchangeable assemblies are 81.3% common to two or more components. An operator needs only one training class to learn how to use, maintain, and repair six different weapon systems. The Stoner touts its use of only 5.56mm ammunition, which simplifies the ammunition supply chain.

Modularly Designed

Due to its design, six separate arms could be built from the basic component group. These include an assault rifle, a carbine, a fixed machine gun, a belt-fed light machine gun, a magazine-fed light machine gun, and a medium machine gun.

group photo of US Navy SEALs in Vietnam one armed with Stoner 63A1 Mk 23 Mod 0 Commando
A group photo of U.S. Navy SEALs in Vietnam. The one in the center is armed with Mk 23 Mod 0 Commando. Image: U.S. Navy

Any firearm in the Stoner weapons system is a selected group of assemblies from the 16 component assemblies, which include the basic component group, the machine gun barrel assembly, the folding buttstock, the bipod, the Stoner or M2 tripod with cradle adapter, the belt feed group, the buttstock, the machine gun rear sight, the magazine, the machine gun forearm, the magazine adapter and forearm assembly, rear side assembly for the rifle or carbine, the solenoid and trigger linkage, the rifle barrel assembly, the carbine barrel assembly, and the magazine adapter for the machine gun.

The Stoner light machine gun can be converted from a rifle into a belt-fed machine gun, or into a magazine-fed machine gun with the magazine inserted on the top (similar to a Bren) quickly and with just a few tools.

The Stoner 63 was fed from a proprietary 30-round magazine or from belts in a box or drum. The machine gun barrel could be removed and replaced while hot using the handle alone, without a glove or any other assistance.

The Stoner was also known for its light weight. Since it was chambered for the 5.56mm, the Stoner machine gun configuration weighed about half as much as the M60 machine gun, allowing gunners to carry much more ammo.

The Operating System

As noted, the Stoner operating system was a piston-driven, air-cooled system that fires from a closed bolt except in machine gun mode, when it fires from an open bolt to improve cooling and prevent cook-offs.

Stoner 63 convertible gun patent drawing
This image from Eugene Stoner’s convertible gun patent shows the various parts of the firearm and its operating system. Image: U.S.P.T.O.

The Stoner has a rotary bolt locking system with seven symmetrical locking lugs that engage the recesses in the barrel extension. When fired, the propellant gases from the cartridge are vented through a gas port into a gas cylinder where they drive the piston and bolt carrier rearward.

Stoner 63 in machine gun configuration patent drawing
The Stoner 63 is shown in its machine gun configuration as part of the patent application. Image: U.S.P.T.O.

Incorporated into the bolt carrier piston assembly is an anti-bounce device consisting of a 4” carbide rod that reduces bolt bounce to prevent firing out of battery during closed bolt operation in the rifle and carbine configurations.

Stoner 63A

Stoner was always improving his design, and in 1966, with the help of user feedback, he introduced the Model 63A. This revised version fixed some of the original’s issues, including a stronger polycarbonate stock and forearm, a redesigned cocking handle, an upgraded feed cover and feed tray, a pair of spring-loaded ejection port covers, and a stainless steel gas tube for corrosion resistance.

US Navy SEAL with Stoner 63A machine gun on boat in Kien Hoa Province Vietnam
A U.S. Navy SEAL with Stoner 63A machine gun (left) exits an assault support patrol boat in the Kien Hoa Province of Vietnam. The SEAL on the right carries an M16 with an XM148 grenade launcher. Image: U.S. Navy

One of the issues with the Stoner design was high cyclic rates. When the Stoner was cold, it fired at around 650 rounds per minute. When it was hot, the rate of fire increased to as much as 1,100 rounds per minute!

That cyclic rate caused the rifle’s mechanical functions to break down, leading to malfunctions and link separations. The fix for that issue was the addition of a rate regulator, similar to the M60 installed in the buttstock, which limited the rate of fire to 800 rounds per minute.

The End Draws Near

According to Jim Sullivan, Stoner’s colleague, the Stoner Weapon System’s lack of acceptance may have been political. As Sullivan recalls, “I left … in 1965 after the Marines had tested the Stoner 63, ordered 300,000 and been shot down by the Senate funding committee which decided that the Marines should use what the Army uses.”

US Navy SEAL in Tiger Stripe camouflage uniform armed with a Stoner 63 machine gun in Vietnam
A U.S. Navy SEAL in a tiger stripe camouflage uniform rests during operations in the Vietnam War. He is armed with a Stoner 63 machine gun. Image: U.S. Navy

The Stoner 63/63A was issued on a trial basis in several configurations to the United States Marine Corps, the Navy SEALs, and U.S. Army Special Forces/MACV-SOG in Southeast Asia.

Although production ended in 1971, the Stoner had loyal followers among America’s special operations units and continued operations with the Navy SEALs and the Marine Corps. The Stoner remained in use with the Mk 23 Model 0 Light Machine Gun configuration until the 1983 invasion of Grenada, and was ultimately replaced by the M249 Squad Automatic Weapon.

In 1971, Cadillac Gage ended development and production of the Stoner 63. Knight’s Armament Company of Titusville, Florida, purchased the remaining Stoner 63 parts and assemblies and produced 100 Stoners. Cadillac Gage produced approximately 4,000 Stoners, most of which were destroyed.

Today, a transferable Stoner 63 fetches an enormous price anywhere north of $80,000. It truly was an advanced weapon system that ended before its time.

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Louis Curdes: The Triple Axis Fighter Ace Who Shot Down His Own Wife by Will Dabbs MD

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
16 million Americans served in World War 2. One in every thirty-eight died. The tale of one of the survivors, WW2 fighter pilot Louis Curdes, is simply amazing.

Estimated reading time: 11 minutes

Weird things happen in war. Combat is chaotic, tragic, and horrible. It is arguably the most compelling of human experiences. As a result, it is a world where a man’s true character is revealed.

Some warriors seem to be innately indestructible. Others arrive in the theater cursed. Among combat aviators, those of the first sort can ultimately accomplish the most amazing things.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
Lou Curdes was a gifted fighter pilot.

Louis Curdes was one of those fighter pilots whose career seemed touched by the Almighty. He flew two different fighter planes in both major theaters of war. He was shot down, taken prisoner, and then escaped to evade behind enemy lines. By the time the guns fell silent, he was one of only three American pilots to have shot down combat aircraft from Germany, Italy, and Japan. However, what came after all that just defies credulity. Read on for the details.

Origin Story of Louis Curdes

Louis Edward “Lou” Curdes was one of two children born to Walter and Esther Curdes in Fort Wayne, Indiana. Dad was a home builder, and Mom taught school. Lou was a natural in basketball and track until his coach caught him smoking and kicked him off the teams.

Curdes showed an interest in aviation from a young age. He studied engineering at Purdue University but dropped out in his third year to join the Army Air Corps. He officially donned the uniform on 6 December 1941, the day before the Japanese attack on Pearl Harbor.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
The Curtiss P-36 Hawk was the radial-engined precursor to the P-40 Warhawk. It was considered a hot ship for its day.

Learning how to fly well enough to do battle with other combat aircraft is not a quick process. In Curdes’ case, for a year he flew PT-13 Stearmans, T-6 Texans, BT-13 Valiants, and Curtiss P-36 Hawks. He graduated from basic flight training and transitioned into Lockheed P-38 Lightnings before being posted to the Mediterranean theater.

A Young Man Goes to War

Lou Curdes was assigned to the 95th Fighter Squadron of the 82d Fighter Group operating over Sardinia, North Africa, and Italy. It was here he got his first taste of aerial combat. It turned out that he was quite adept at it.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
The Lockheed P-38 Lightning is such a graceful-looking airplane.

The P-38 was the finest multi-role fighter in the world at the time of its introduction. Fast, rugged, versatile, and survivable, this massive twin-engine fighter plane was, in my opinion at least, also the prettiest warplane ever contrived. While it struggled to maneuver in the close fight with nimble single-engine fighters like the German Bf-109 and Fw-190, the Lightning could do so many things that these lesser aircraft could not. One of those unconventional missions was that the big twin-boomed bird made quite the passable bomber.

Curdes Shows Potential

On 29 April 1943, Curdes and his mates were tasked to perform a skip-bombing mission in the Straits of Sardinia. The big Lightnings would roar in just above the wave tops, drop their bombs, and bounce them into enemy ships just as though they were skipping rocks on a pond. When Curdes’ turn came to release his bombs he found that one of his shackles was defective. Curdes’ flight was subsequently bounced by a dozen German Bf-109s. He would have to go head-to-head with these nimble enemy fighter planes while lugging a big fat bomb around the sky.

Despite the extra weight and drag, Curdes promptly destroyed one Bf-109 and badly damaged another. He then spotted a pair of Messerschmitts attacking a crippled Lightning. Curdes turned into the fight and downed them both before escorting the damaged aircraft back across friendly lines. In that single engagement, while flying a defective airplane, Lous Curdes downed three German fighters and damaged a fourth. Before the month was out he shot down another two while on a mission escorting B-25 Mitchell bombers near Villacidro, Sardinia. Lou Curdes had become an ace in his first thirty days in combat.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
The Bf-109 Messerschmitt was the most-produced aircraft of the war. Some 35,000 copies rolled off the lines by the end of the conflict.

Louis Curdes Is MIA

Over the next two months, Louis Curdes bagged another pair of Bf-109s and an Italian Macchi C.202. On 27 August 1943, Curdes and his fellow Lightning pilots were jumped by a whopping fifty Axis planes. In the chaotic aerial melee that ensued he downed a further two Bf-109s before having his own plane shot to pieces. He subsequently belly-landed his fighter with the gear up on a beach ten miles south of Salerno. Subsequent scholarship is fairly certain that Curdes was the 63rd victory of the expert German pilot Franz Schieß.

Curdes was captured by the Italians but escaped in short order before being recaptured. The Italians threw in the towel four days later and capitulated to the Allies. In response, the Italian prison guards turned their weapons over to the American aviators with their best wishes and melted into the countryside. However, by now this part of Italy was just filthy with Germans.

Over the next several months, a group of roughly twenty Allied pilots slowly made their way over the Apennine Mountains on foot heading inexorably south toward the advancing Allied vanguard. Communist resistance fighters and sympathetic locals supplied them with food, weapons, and civilian clothes. Throughout it all, Curdes’ family had been informed that he was missing in action and presumed dead.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
This is the battlefield around Monte Cassino. Louis Curdes finally made contact with advancing Allied troops in this ghastly place.

On 27 May 1944, exactly nine months after ditching his Lightning, Curdes finally found himself at Monte Cassino. He and a buddy slipped through German positions until they reached a British Infantry unit. Lou Curdes’ war in Europe was over.

And Now for Something Completely Different…

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
This is a reproduction of Lou Curdes’ P-51 Mustang on display at the Pima Air Museum. Eric Salard photo.

Repatriated POWs were prevented from fighting again in the theater where they were captured. I can only presume this was to help protect the details of the resistance networks that had helped them evade. As a result, after a brief stint at home, Lou Curdes subsequently shipped out to the Pacific, this time to fly P-51 Mustangs. On 7 February 1945, Curdes and his wingman came across a Japanese Mitsubishi Ki-46-II “Dinah” twin-engine reconnaissance plane while on a combat patrol 30 miles southeast of Taiwan. Curdes shot this enemy plane down without difficulty. This meant he had bagged enemy aircraft from all three major Axis powers.

Ballistic Matrimony

On 10 February 1945, Curdes and three other pilots were on patrol near the island of Bataan in the Philippines. They spotted a Japanese-held airfield and dove into the attack. In the process, one of Curdes’ squadron mates named LT La Croix fell to ground fire. La Croix ditched his Mustang just offshore and inflated his life vest. The other three Mustangs circled menacingly, keeping the Japanese defenders at a distance.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
The C-47 Skytrain was the primary American transport aircraft of WW2.

While they waited for the PBY Catalina flying boat to retrieve their buddy, an American C-47 cargo plane appeared unexpectedly and began heading for the airfield. Lou Curdes broke off and attempted to contact the big transport. Unable to raise them on the radio, Curdes soon realized that they intended to land on the Japanese airbase.

Desperate to wave them off, Curdes flew his Mustang off the nose of the larger American plane to no avail. The C-47 was now 150 feet over the water with its landing gear down and aligned with the runway. Out of options, Curdes carefully maneuvered to within 20 yards of the C-47 and shot out one engine with a quick burst of .50-caliber fire. The persistent C-47 pilot was not to be dissuaded, however.

Curdes Pulls An Unexpected

Curdes then snapped his agile Mustang to the opposite side of the C-47 and blasted the remaining engine. Now transformed into a glider, the C-47 ditched successfully some 300 yards from shore. Miraculously, the 12 Americans onboard successfully egressed the sinking airplane and got into life rafts. Meanwhile, LT La Croix paddled furiously and joined the C-47 crew in one of the small inflatable boats. The current carried the downed Americans about a mile offshore while under small arms fire from the Japanese on the beach.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
When equipped with external drop tanks, the P-51 had a simply breathtaking range. This allowed the Mustang to access remote parts of the Pacific theater not otherwise accessible to shorter-range fighters.

The PBY never arrived. Now desperately low on fuel and out of daylight, Curdes and his two remaining buddies returned to base. They launched in the pre-dawn darkness along with a PBY and successfully retrieved the American castaways. Once the lumbering PBY finally made its way back to base, Curdes was shocked to find that one of two women onboard the C-47 he had shot down was Svetlana Valeria Shostakovitch Brownell, an Army nurse with whom he had enjoyed a date the previous evening.

Details

It turned out that the C-47 had been lost in bad weather with a malfunctioning radio. Flying on fumes, the pilot was determined to land at the first available airfield. Had they indeed touched down at the Japanese airbase there is no telling what might have happened to the two American nurses. Given the prior bad behavior of Japanese troops regarding POWs, Curdes undoubtedly saved them from a horrible fate.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
Yep. Louis Curdes painted an American flag on the side of his personal Mustang Bad Angel.

Curdes later transitioned back into P-38s and flew close air support missions in the Philippines until he finally rotated home. In a total of 48 combat missions, Curdes was credited with shooting down seven Bf-109s, the Macchi C.202, the Japanese Ki-46, and one US Army Air Corps C-47. Yes, he did paint an American flag on the side of his Mustang, Bad Angel, alongside the rest of his kills.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
Louis Curdes eventually flew in the Berlin Airlift.

After the war, Lou Curdes flew C-54 Skymasters as part of the Berlin Airlift. He finally retired after 22 years of military service and spent the rest of his professional life running his own construction company. However, once WW2 wound down he looked up Svetlana Valeria Shostakovitch Brownell.

3-Will-Louis Curdes: The Triple Axis Ace Who Shot Down his Own Wife
Lou Curdes’ extraordinary combat exploits ultimately laid the foundation for a moving love story.

Conclusion

Curdes’ quick thinking that fateful day over the island of Batan had indeed saved Svetlana from gruesome internment or worse. To show her abiding appreciation for his attention she subsequently married him. They remained together for another 49 years until Curdes died in 1995.

War is arguably the most horrible of human pursuits. Young lives are snuffed in ghastly numbers, oftentimes for some of the most dubious of causes. However, sometimes out of the cauldron of war comes something genuinely pure, sweet, and good. For their part, Lou and Svetlana Curdes’ long rich marriage was birthed out of muzzles of half a dozen .50-caliber machineguns in the cobalt blue skies above the South Pacific.

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