The M1 Garand is correctly considered the best battle rifle of World War II. It was the only semi-automatic rifle — meaning that it fired each time the operator pulled the trigger — to be the standard issue infantry rifle of any army during the war. Other forces were equipped with bolt-action rifles — the British Lee Enfield, Soviet Mosin Nagant, Japanese Type 99, German K98k, etc. — that required the operator to manually pull back a bolt to eject the [expended cartridge], and then push it forward again to insert a fresh cartridge into the chamber. The most obvious advantage was an increased rate of fire: a semiautomatic rifleman with an M1 had an official aimed rate of fire of 24 shots per minute.¹ Compare this to the 15 aimed shots that British soldiers were expected to pop off with a bolt-action Lee Enfield in a “mad minute” drill. And the Lee Enfield was one of the fastest bolt-action rifles ever produced! In a pinch, a GI could blast out a clip in a few seconds, approximating a burst from an automatic weapon.² Furthermore, with semi-automatic fire, the shooter could stay focused on his target, whereas working the bolt generally forced the shooter off target, requiring time to reacquire a proper sight picture.

Lt. General George Patton famously called the M1 Garand “the greatest battle implement ever devised“, a quote often repeated reverently in the context of World War II nostalgia. The US Government after the war gave away millions of M1 Garands, making it a popular civilian rifle for hunting and competitive shooting.

But nostalgia aside, it is also possible to view, from the high perch of hindsight, the M1 Garand as a missed opportunity. The most advanced battle rifle of World War II ultimately looked back too much to the past rather than pointing the way to the future. During its development, senior military officials applied the perceived lessons of the Spanish American War to a rifle designed to solve the problems of the Great War. This intervention prevented the M1 Garand from becoming something closer to a modern assault rifle, with an intermediate power cartridge and higher magazine capacity. The army was in no hurry to ditch the rifle that had won World War II, meaning that the United States did not field its first true assault rifle until two decades after the concept had been invented by the Germans in 1943 and soon successfully adapted by the Soviets in 1947. The first American assault rifle, the M16, would not debut until 1965.

First a necessary caveat: rifles were not the decisive weapon in World War II. For the most part the small arms deployed by the United States had been designed to fight World War I: the Browning Automatic Rifle (1918), the M1919 Browning Medium Machine Gun (as the date implies, first fielded in 1919) and the M2 Browning heavy machine gun, designed in 1918 and so good it is still used over a century later. In contrast, German machine guns were somewhat more recent in design: the MG 34 (as the name implies, first fielded 1934) and the MG 42. During the war, the Germans invented the first true assault rifle, the StG 44.

The secret sauce of the US Army by 1944-45 had little to do with firearms at all: it was a combination of ready mobility through motorization combined with deadly artillery and close air support, enabled by an unmatched communication system that allowed forward observers to direct and adjust fires to lethal effect. The American way of war was rooted in fleets of trucks and jeeps, networks of radios and heaps of shells. Having a nice semi-automatic rifle was ancillary to a conflict like World War II. But the M1 Garand is a useful window into the vagaries of military procurement and technological innovation, which require developers to at once predict the operational environment of the future and analyze the lessons of the past.

Throughout the 1920s, officers at the Infantry School in Fort Benning experimented with new tactics that they hoped would again allow for mobile infantry combat and avoid the trench stalemate of World War I. The basic solution was some form of “fire and maneuver”, in which one section of a unit (say a squad or platoon) would lay down a sufficient base of small arms fire to suppress the enemy so as to facilitate the other section’s advance. By alternating suppression and assault the element might leapfrog its way forward, even against entrenched enemy machine guns.

For such a tactic to work, infantry platoons needed a lot of firepower. Some might come from light machine guns, like the Browning Automatic Rifle, which was issued to individual infantry squads. But it was generally realized that individual infantrymen needed to be capable of a far higher rate of fire than could be provided by the standard issue rifle, the bolt-action M1903 Springfield, fed from a five round magazine. To this end, the US government set about developing a semi-automatic rifle.

The charge was taken up by John C. Garand, a Canadian-born, self taught firearms designer who worked for the Springfield Armory in Massachusetts. Garand’s solution to make the rifle self-loading was to insert a piston beneath the barrel. When the gunpowder exploded in the cartridge, the gas produced in the explosion propelled the bullet out the barrel. But some gas was bled off into a cylinder below the barrel (which gives the M1 its peculiar appearance of seeming to have two barrels); the pressure of the gas in the cylinder drove a piston.³ This piston attached to an operating rod which pushed the bolt of the rifle back, ejecting the spent casing, and allowing a spring in the internal magazine to insert another cartridge into the chamber before a separate spring pushed the operating rod forward and closed the bolt for the next shot, all in a fraction of a second.

Garand had initially worked on a rifle chambering the standard .30-06 cartridge used by the M1903 Springfield rifle (the .30 indicates that the bullet had a diameter of .30 inches, while the 06 indicates that the cartridge had been adopted in 1906; the round is often pronounced “thirty-ought-six”. But when a rival designer named John Pedersen, also affiliated with Springfield Armory, developed a semi-automatic design that chambered a lighter .276 (7mm) round, Garand retooled his project for the lighter round as well, producing a prototype known as the T3, with subsequent refinements labeled the T3E1 and T3E2. The smaller round meant that the internal magazine of the T3E1/2 could accept clips of 10 bullets, doubling the magazine capacity of the M1903 Springfield.

Army officials were very interested in the new round, but wanted proof that a lighter bullet would be sufficiently lethal in combat. A series of grisly ballistic tests were therefore ordered, pitting the .276 round against the traditional .30-06. In 1928, anesthetized pigs were shot through with both rounds. To the surprise and consternation of traditionalists, the .276 did far more damage in the so-called “Pig Board”. This is not paradoxical: the lighter round was more likely to “tumble”, precisely because it was lighter and so more likely to have its trajectory disrupted by bone and tissue; the tumble meant that more of the kinetic energy was expended inside the target, causing far more damage. The .30-06, meanwhile, as a more powerful round, was more likely to punch clean through, retaining its kinetic energy to keep moving forward after passing through the target. Eventually, tests of this sort would be used to sell the army on the lethality of the 5.56mm round used by the M16/M4, which has an even greater tumble, and causes even more grievous injuries. Out of concern that the fat bodies of pigs did not accurately replicate the human teenagers that the new round was designed to kill, a new test was inflicted upon goats, seen as more appropriately lean and therefore better analogs. The result was the same in favor of the .276 (a lighter .256 performed even better). With two rounds of tests vindicating the .276, the Army demanded that its new rifle chamber the .30-06. The final decision was made by Douglas MacArthur himself.

The .30-06 round itself had been the product of a painful lesson learned during the Spanish American War. Here, American troops, armed with Krag M1892 rifles, had found themselves badly out-ranged by Spanish troops armed with Mausers; the famous charge up San Juan Hill occurred after US troops had advanced for some distance under a hail of unanswered rifle fire. Given the importance of sharp shooting to the American military mythos, getting handily outranged and outshot by Spanish forces was a painful embarrassment. The first order of business had been to adopt the Mauser design: the M1903 Springfield was essentially a modified Mauser, as the US government had licensed a number of Mauser’s patents. By upgrading the M1903 to take the heavy .30-06 round, the Army ensured that soldiers could engage targets over a kilometer away. Beyond the deeply ingrained “lessons learned” from the Spanish American War, the mythos of the deadly American sharpshooter was strongly entrenched. Even as disruptors at Benning developed new infantry tactics that stressed volume of fire over accuracy, the phantoms of buck skinned frontiersmen sniping at British redcoats from a thousand paces still occupied the headspace of military leaders; they wanted a rifle with long distance accuracy. The sights on the M1 Garand adjust out to 1200 yards.

But MacArthur’s reasoning seems to have been primarily motivated by administrative and logistical concerns, as he cited the generic difficulties of fielding a lighter round. Some of these challenges may have been related to production and distribution of a sufficient stockpile of new caliber ammunition. There may have also been a concern with the new round complicating the logistics of line companies. The army also used .30-06 for the BAR and Browning medium machine gun, and having all of these shoot the same round in theory simplified the supply of line companies, and allowed for cross-leveling between weapons systems. Similar concerns have the US Army maintaining a policy of only having 5.56mm weapons at the squad level (thus the M4 and M249 Squad Automatic Weapon both shoot 5.56, and the SAW can shoot from M4 magazines).⁴ Still, MacArthur’s concerns seem unfounded in hindsight. The United States was about to produce billions of bullets during World War II. American troops were about to be so lavishly supplied that distributing two types of bullets would have been readily feasible given the soon to be proven quality of American logistics.⁵

With MacArthur’s edict, Garand retooled his rifle back to the .30-06 caliber, and his design was finally accepted in 1936. But the larger and more powerful round required a design change: the internal magazine now took clips of eight bullets instead of ten. Two rounds may not sound like much, but every bullet can be precious in a firefight, and this represented a 20% reduction in magazine capacity. Spread over a company sized element, the reduced clip capacity represented over two-thousand fewer rounds that a company commander could expect to fire and maneuver with. Indeed, the M1’s volume of fire proved generally insufficient to suppress the enemy on its own during the war, evidenced by the habit of equipping rifle squads with two Browning Automatic Rifles, instead of one. Marine divisions by the end of the war often deployed three BARs per squad.⁶

Michael Taylor, “Michael Taylor on The Development of the M1 Garand and its Implications”, A Collection of Unmitigated Pedantry, 2023-09-08.

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1. TM 9-1005-222-12.

2. Thus George Wilson, a platoon leader and later company commander in the Fourth Infantry Division, describing a platoon scout stumbling upon the enemy: “The second scout emptied the eight round clip in his M-1 so fast it seemed like a machine gun … the rest of us moved very cautiously and found three dead enemy soldiers in the road.” (G. Wilson. If You Survive. Ivy, 1987).

3. John Garand’s initial design, and early production M1s, had a gas trap inserted over the muzzle to catch the gas after the bullet had exited; when this proved prone to fouling, a design modification drilled a small hole in the barrel just before the muzzle to allow the gas to bleed into the cylinder, most M1 Garands had this “gas port” system.

4. In 2023, US Army infantry will begin transition to the M7 carbine and M250 Squad Automatic weapon, which will both use a 6.8mm bullet, out of concerns that the 5.56 NATO is insufficient to penetrate body armor.

5. Editor’s Note: I agree with Michael here in principle: US logistics could have managed this. But I would also note that part of the reason American logistics were so good is that they applied MacArthur’s reasoning to everything, reusing vehicle chassis, limiting the number of different ammunition calibers and demanding interchangeable parts across the whole range of military equipment. Take one of those decisions away and the whole still functions. Take all of them away and one ends up with the mess that was German production and logistics.

6. Editor’s Note: BAR goes BARRRRRRRRRRR.