The name Auto-Ordnance is forever linked to one of the most recognizable firearms in history: the Thompson submachine gun — the "Tommy Gun," the "Chicago Typewriter," the weapon that defined an era of American gangsters, G-men, and GIs. But the story of Auto-Ordnance is more than just one gun. It's the story of a brilliant but frustrated ordnance officer who believed he could change warfare, a startup that nearly failed before its first sale, a gun that became notorious for the wrong reasons, and an improbable comeback that made Auto-Ordnance an American institution. This is the complete history of Auto-Ordnance Corporation.
Founding
Auto-Ordnance Corporation was founded in 1916 by Brigadier General John Taliaferro Thompson, a man whose entire career had pointed toward this moment. Born in Newport, Kentucky, in 1860, Thompson graduated from West Point in 1882 and was commissioned as an artillery officer. He quickly gained a reputation as one of the Army's foremost small arms experts. As Chief of the Small Arms Division of the Ordnance Department, Thompson supervised the development of the M1903 Springfield rifle and the adoption of the .45 ACP M1911 pistol — experiences that would shape his thinking about what a modern military firearm should be.
Thompson retired from the Army in 1914, just as World War I was erupting in Europe. He watched the war's first months with the trained eye of an ordnance expert and was horrified by what he saw. The Western Front had degenerated into trench warfare — a static, grinding slaughter where infantry advances were cut down by machine gun fire. Thompson believed he saw the solution: a lightweight, fully automatic weapon that individual soldiers could carry, capable of delivering "trench-broom" firepower at close range. A weapon that could sweep enemy trenches clear with a hail of bullets, breaking the stalemate.
In 1916, with backing from financier Thomas Fortune Ryan, Thompson founded the Auto-Ordnance Corporation in Cleveland, Ohio. The name was chosen deliberately: "Auto-Ordnance" suggested automatic military weapons, and the company's stated purpose was "to develop and market automatic small arms for military purposes." Thompson hired Theodore H. Eickhoff, a talented engineer who had worked with him at the Ordnance Department, to lead the technical team, and brought in Oscar V. Payne, a brilliant young designer who would prove instrumental in solving the gun's technical challenges.
The Early Years
The first design challenge was the action. Thompson's original vision was for a rifle-caliber automatic weapon, but existing automatic rifle mechanisms were unreliable and heavy. Eickhoff and Payne explored several approaches before settling on a concept patented by John Bell Blish, a career U.S. Navy officer. Blish had observed that certain metals, when machined at specific angles, exhibited an adhesion effect under high pressure — they would "stick" together and then release as pressure dropped. Blish believed this principle could be used to create a delayed-blowback firearm action, and he patented the idea in 1915.
The Blish lock became the heart of the Thompson gun's action. The idea was that a bronze locking wedge, machined at a precise angle, would lock the bolt closed under the high pressure of firing, then unlock and allow the bolt to cycle as pressure dropped. In practice, the Blish lock was more complex than necessary — later testing showed it provided negligible delay, and the Thompson functioned essentially as a straight blowback weapon — but it worked reliably and satisfied the patent requirements.
The ammunition question was equally important. Thompson originally envisioned a rifle-caliber weapon, but the .30-06 cartridge was far too powerful for a handheld automatic. Payne's team developed what became the .45 Remington-Thompson cartridge — essentially a .30-06 case shortened and necked up to .45 caliber, pushing a 250-grain bullet at about 1,450 feet per second. This cartridge was powerful, but when the United States entered World War I in 1917, the Army made it clear that any new weapon must be chambered in .45 ACP — the same cartridge as the M1911 pistol, to simplify logistics. Thompson's team adapted, and .45 ACP became the Thompson's standard caliber.
The first working prototype — the Thompson Persuader — was completed in 1918, with belt-fed versions (the Persuader) and magazine-fed versions (the Annihilator) under development. But the war ended in November 1918 before the Thompson could be deployed. The gun that was supposed to break the trench stalemate had missed its war by a matter of months.
Key Historical Milestones
1919 — The Thompson Submachine Gun Is Born
With the war over and military contracts evaporating, Auto-Ordnance faced an existential crisis. The company had a revolutionary weapon but no customers. Thompson made a fateful decision: rebrand the gun for the civilian market. In 1919, the weapon was officially designated the Thompson Submachine Gun — Thompson himself coined the term "submachine gun" to describe a handheld, pistol-caliber automatic weapon. The first production model was the Thompson Model 1919, essentially a refined prototype, and the company began demonstrating it to potential buyers.
This is where the Thompson story takes its most famous twist. With military sales stalled, Auto-Ordnance marketed the Thompson to law enforcement agencies and — controversially — to the general public. The gun was advertised in magazines as "the safest gun to have in your home" and was available for mail-order purchase by any American citizen. The Thompson's appearance in the civilian market coincided with the rise of organized crime during Prohibition, and the Tommy Gun quickly became the weapon of choice for gangsters. It was compact, fired a hard-hitting .45 caliber round, and could empty a 50-round drum magazine in seconds. For criminals facing rival gangs or the police, nothing else came close.
1921 — The Thompson Model 1921
The first mass-produced model was the Thompson Model 1921, manufactured under contract by Colt's Patent Fire Arms Manufacturing Company in Hartford, Connecticut. Colt produced 15,000 Thompson Model 1921 guns between 1921 and 1922, distinguished by their finned barrels, vertical foregrip, adjustable Lyman rear sight, and exquisite fit and finish — these were the Cadillac of submachine guns, built to peacetime commercial standards. The Model 1921 had a cyclic rate of fire of approximately 800 rounds per minute, and could be fitted with 20-round box magazines, 50-round drum magazines, and — most dramatically — the 100-round "C" drum. At $225 per gun (equivalent to about $3,500 in 2025 dollars), it was expensive, but demand was strong — or so it seemed.
In reality, Auto-Ordnance struggled to sell the initial Colt production run. Military orders were negligible, and most law enforcement agencies were skeptical of automatic weapons. The company spent years working through the inventory, selling guns to police departments, private security firms, and individuals. Some of those individuals, tragically for the Thompson's reputation, were gangsters.
1929 — The St. Valentine's Day Massacre
On February 14, 1929, seven members of Chicago's North Side Gang were lined up against a garage wall and executed by four gunmen — two of whom were armed with Thompson submachine guns. The St. Valentine's Day Massacre horrified the nation and cemented the Thompson's image as a gangster's weapon. Seventy rounds of .45 ACP were fired in a matter of seconds. The Tommy Gun had become the "Chicago Typewriter."
The massacre galvanized support for federal gun control legislation. The National Firearms Act of 1934 imposed a $200 tax on the transfer of machine guns (equivalent to over $4,500 today), effectively ending civilian sales of fully automatic weapons. Auto-Ordnance's civilian market collapsed. But the gun's fearsome reputation had also caught the attention of the U.S. military and the FBI, which began purchasing Thompsons in increasing numbers to counter heavily armed criminals.
1928 — The Thompson Model 1928
In 1928, Auto-Ordnance introduced the Thompson Model 1928, a simplified version of the 1921 designed to be more affordable and easier to manufacture. The cyclic rate was reduced to approximately 600 rounds per minute by installing a heavier actuator, making the gun more controllable. The Model 1928 also incorporated a horizontal foregrip (replacing the vertical grip on most military models) and simplified sights. The U.S. Navy and Marine Corps adopted the Thompson Model 1928 in limited numbers, and the gun saw its first combat use in the Banana Wars in Central America and the Caribbean, where Marines used Thompsons to devastating effect in jungle fighting against insurgent forces.
| Specification | Thompson M1928A1 |
|---|---|
| Caliber | .45 ACP |
| Capacity | 20-round box / 30-round box / 50-round drum |
| Barrel Length | 10.5 inches (267mm) |
| Total Length | 33.75 inches (857mm) |
| Weight (unloaded) | 10.8 lbs (4.9 kg) |
| Action | Delayed blowback (Blish lock) |
| Rate of Fire | ~600-700 rounds/min |
| Production Years | 1928-1942 |
1939-1945 — World War II
World War II transformed Auto-Ordnance from a struggling commercial enterprise into a major defense contractor. The British Army, desperate for automatic weapons after Dunkirk, placed massive orders for Thompson submachine guns. Between 1940 and 1942, Britain purchased over 300,000 Thompsons, and the gun became a staple of British Commando units and infantry squads in North Africa and Europe.
The U.S. Army also adopted the Thompson as its standard submachine gun. The M1928A1 was the primary wartime variant, incorporating military-requested modifications: a simplified rear sight, a horizontal foregrip, and a detachable stock. Over 1.5 million Thompsons were produced during the war by Auto-Ordnance and its licensee, Savage Arms.
But the Thompson was expensive and complex to manufacture. Each gun required extensive machining — the receiver alone involved over a dozen milling operations. At $209 per gun in 1942 (about $3,800 in 2025), the Thompson was far more expensive than the simplified M3 "Grease Gun" (about $20 per gun), which was introduced in 1943 as a cheaper alternative. Recognizing this, Auto-Ordnance developed the Thompson M1 — a simplified, military-only variant that eliminated the Blish lock entirely, replaced the complex Lyman sights with a simple peep sight, and used a fixed firing pin on the bolt face. The M1 could only use box magazines (no drums), but it was faster and cheaper to produce.
The Thompson M1 and the further-simplified M1A1 served alongside the M3 Grease Gun through the remainder of World War II and into the Korean War (1950-1953). The Thompson was finally withdrawn from U.S. service in the early 1960s, replaced by the M14 rifle and later the M16. But in the hands of GIs from Normandy to Okinawa to the Chosin Reservoir, the Tommy Gun had earned its place in American military history.
Post-War and Decline
After World War II, Auto-Ordnance struggled to find a peacetime role. Military production contracts ended, and the National Firearms Act of 1934 was further tightened by the Gun Control Act of 1968, which effectively banned the importation and civilian sale of machine guns. Auto-Ordnance limped through the 1970s and 1980s as a shadow of its former self, producing small batches of parts and accessories. The company changed hands several times, and by the 1990s, the original Auto-Ordnance Corporation had effectively ceased to exist as a manufacturing entity.
1999 — Kahr Arms Revival
In 1999, the Auto-Ordnance brand and trademarks were acquired by Kahr Arms, a relatively young firearms manufacturer founded by Justin Moon (son of Unification Church founder Sun Myung Moon). Kahr recognized the enduring appeal of the Thompson name and set out to revive the brand — this time focused on the civilian market with semi-automatic-only versions of the classic Thompson designs.
The revived Auto-Ordnance, based in Greeley, Pennsylvania, produces semi-automatic Thompson carbines in a variety of configurations, including faithful reproductions of the M1928 and M1A1 with 16.5-inch barrels (to comply with federal law) and the classic vertical foregrip, finned barrel, and drum magazine compatibility. The company also produces M1911 pistols under the Auto-Ordnance name — a fitting tribute to General Thompson, who had overseen the M1911's adoption decades earlier.
Iconic Firearms
Thompson Model 1921
The Model 1921 was the original production Thompson — and remains the most collectible variant. Built by Colt with exquisite craftsmanship, the 1921 featured a finned barrel, adjustable Lyman rear sight, and the famous vertical foregrip. Its high rate of fire (800 RPM) made it devastating but harder to control than later variants. Only 15,000 were made, and original Colt-produced Model 1921s in good condition can command over $50,000 at auction today. The Model 1921 was the gangster's Tommy Gun — the version used in the St. Valentine's Day Massacre and carried by John Dillinger, Pretty Boy Floyd, and Baby Face Nelson.
Thompson M1928A1
The M1928A1 was the primary military Thompson of World War II. With a reduced rate of fire (~600 RPM), horizontal foregrip, and simplified sights, it was more controllable and easier to produce than the Model 1921. The M1928A1 could accept both box and drum magazines, and its distinctive Cutts compensator (a muzzle device designed to reduce muzzle climb during automatic fire) gave it an unmistakable profile. The M1928A1 was the Thompson most commonly encountered by Allied soldiers in Europe and the Pacific.
Thompson M1A1
The M1A1 was the ultimate wartime simplification of the Thompson. It eliminated the Blish lock, the Cutts compensator, the finned barrel, and the drum magazine capability — all in favor of simplified, faster production. The M1A1 used a simple peep sight instead of the Lyman adjustable, and its bolt had a fixed firing pin. The M1A1 was the Thompson at its most rugged and utilitarian, and it served through World War II and Korea. Over 500,000 M1 and M1A1 Thompsons were produced.
Auto-Ordnance M1911 (Kahr Era)
Under Kahr Arms ownership, Auto-Ordnance expanded into the M1911 pistol market, producing faithful reproductions of the classic .45 ACP pistol. These are semi-automatic-only, and while they don't carry the historical significance of the wartime Thompsons, they connect the modern Auto-Ordnance brand back to General Thompson's original legacy — the M1911 adoption that he oversaw as Chief of Small Arms over a century ago.
Legacy and Modern Era
The Thompson submachine gun's cultural impact far exceeds its military significance. It is one of the few firearms that is instantly recognizable to people who know nothing about guns — the silhouette of a Tommy Gun, with its drum magazine and vertical foregrip, is an American icon on par with the Colt Peacemaker. It appears in countless films, from classic gangster movies like "The Public Enemy" (1931) and "Scarface" (1932) to World War II epics like "Saving Private Ryan" (1998) and the "Band of Brothers" series (2001). It's been wielded by actors from James Cagney to Tom Hanks.
Today, the Auto-Ordnance brand continues under Kahr Arms, producing semi-automatic Thompson carbines for the civilian market. These modern Thompsons are not the fully automatic gangster guns of the 1920s, but they faithfully reproduce the look, feel, and weight of the originals. For collectors and history enthusiasts, they offer the closest thing to owning a genuine Tommy Gun short of the prohibitive cost and paperwork required for original fully automatic examples.
Original Auto-Ordnance Thompsons — particularly Colt-made Model 1921s — are among the most valuable American firearms. They represent a unique intersection of military history, criminal folklore, and American industrial craftsmanship, and they continue to command extraordinary prices at auction.
MatchMyGun Verdict
Auto-Ordnance and the Thompson submachine gun occupy a unique place in firearms history — equal parts military innovation and cultural phenomenon. The Tommy Gun was over-engineered, expensive, and heavy by any objective measure, but it was also reliable, hard-hitting, and exquisitely made. General Thompson's vision of a "trench broom" didn't break the stalemate of World War I, but his gun went on to serve through World War II and became an American icon in the process. The MatchMyGun verdict: a flawed masterpiece that became a legend — the most famous submachine gun in history, and a testament to American ingenuity at its most excessive.