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5 Firearms the U.S. Army passed on. From My Daily Kona

U.S. Army Reserve Sgt. 1st Class Harrison Brewer, G4 Chief Movements Supervisor for the 335th Signal Command (Theater), fires an M16 rifle on a range at Fort Gordon, Georgia, March 8, 2019.
Soldiers from the 335th Signal Command (Theater) headquarters completed warrior tasks and battle drills to include weapons qualification, grenade practice and roll over training during a four-day training designed to increase their warfighting abilities. (U.S. Army Reserve photo by Staff Sgt. Leron Richards)© Provided by 1945

Firearms design isn’t easy, and even trained engineers have had trouble turning a concept into a reliable weapon.

And while countless small arms used by the United States Army became the stuff of legend, for every success like the Thompson submachine gun or M1 Garand there are those guns that are best forgotten.

While we won’t claim this is comprehensive, here are our top picks of some of the worst U.S. Army guns ever. Thankfully, most never saw wide service on the battlefield, or none at all.

 

THOMPSON AUTO RIFLE

Forgotten Firearms: 5 Guns the U.S. Army Passed On© Provided by 1945

Thompson Autorifle Model 1923 (top) and SMG Model 1921.

The Thompson submachine gun or “Tommy Gun” has become one of the most iconic firearms of the 20th century and certainly one of the most successful submachine gun designs. It is perhaps even as famous as the AK-47, and the Thompson is clearly the forerunner of the modern “black gun.”

Yet, the Thompson wasn’t an instant hit, and the role that John T. Thompson actually played in the design and development of the weapon bearing his name has remained a matter of conjecture.

What is known is that his follow-up, the Thompson Autorifle Model 1928, developed for the U.S. military’s semi-automatic rifle trials, didn’t do much to impress anyone. Chambered in .30-06, it utilized a delayed blowback operation rather than the more complex gas-operated action, which is used in innumerable other self-loading/semi-automatic rifles. Thompson’s design required lubricated ammunition and it reportedly ejected spent casings in such a violent manner that it was reportedly hazardous to those around the shooter.

M50 REISING

As some 100,000 were actually ordered during the Second World War, the M50 Reising may not have truly been rejected – but perhaps it should have been. Developed by Eugene Reising, the compact submachine gun promised to be a “poor man’s Thompson” as it was cheaper to produce, more compact, and lighter. It fired from a closed bolt, which allowed for greater control even in full-automatic mode.

Forgotten Firearms: 5 Guns the U.S. Army Passed On© Provided by 1945

A United States Coast Guardsman with working dog and Reising SMG during WWII.

It seemed to have everything going for it – but its 20-round magazine was just the first of the problems. Moreover, while the weapon was reliable in ideal conditions, the jungles of the Pacific with sand, humidity and saltwater meant the complex delayed-blowback operation would jam frequently. It was difficult to maintain, made worse by the fact that many parts were hand fitted at the factory. By the end of the war, the Reising was relegated to the guards at war plants. While its reputation improved after the war when it was used by U.S. law enforcement, its wartime role sealed its fate.

THE MODEL 45A

A mystery design from the war was the little-remembered Model 45A, a weapon that was developed at the end of the war and which seems as revolutionary now as it must have been then.

Forgotten Firearms: 5 Guns the U.S. Army Passed On© Provided by 1945

Model 45A. Image: Creative Commons.

The Model 45A was a .30 caliber bullpup designed to be a hybrid battle rifle/light machine gun. Developed by the Army in 1945 in the Philippines, it utilized a Browning Automatic Rifle magazine and featured an integral scope/carrying handle – thus making it look similar in profile to the Austrian Steyr AUG. Why it was developed has remained a mystery, as there no known surviving prototypes and apart from some U.S. Army Signal Corps photos, little evidence survives to show this gun even existed.

ARMALITE AR10

Before Eugene Stoner developed what would become the AR15/M16, there was the AR10. Developed in the 1950s, the AR10 clearly shows what Stoner had in mind – and this is a case where it took one failure to get the weapon refined according to standards. Chambered in 7.62x51mm NATO or .308 Winchester, the AR10 featured an innovative straight-line barrel/stock design and made use of phenolic composites and forged alloy parts, which made it lighter than contemporary weapons.

U.S. Army Guns© Provided by 1945

Stripped AR-10. Image: Creative Commons.

However, when one of the prototypes failed in early testing, the damage was done. The weapon seemed too revolutionary for military thinkers who sought to go with an improved version of the M1 Garand, which resulted in the adoption of the M14.

Eventually, the design was refined and could go on to be the AR-15. Yet, had the modern ArmaLite Inc. not released a commercial AR10, it might have been simply a largely forgotten part of the AR15 story.

STONER 63

After Stoner made his mark with the AR-15/M-16 design, he set about developing a modular firearm that was simply too innovative for its time. The Stoner 63 could transform from rifle to carbine to machine gun by swapping out parts.

U.S. Army Guns© Provided by 1945

Stoner 63. Image: Creative Commons.

It could fire from a rear-loading magazine as a rifle/carbine or light machine gun with top loading magazine or even via a belt as a squad automatic weapon. In total, some 4,000 of the two main versions were produced and the Stoner 63 even saw some field testing in Vietnam as well as in the invasion of Grenada in 1983. Yet, despite the fact that it was well-liked by the SEALs and other units it was never widely adopted by the U.S. military.

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Army Testing New XM8 Carbine (No, Not That XM8) by Guy J. Sagi

U.S. Army Soldier with the Army Marksmanship Unit conducting rifle drills with the XM8 at Fort Benning, Ga, February 2026.
Image courtesy of the U.S. Army.

Some members of the U.S. Army will begin receiving a new XM8 carbine for testing in October 2026, a shorter, lighter version of the M7 rifle introduced under the branch’s Next Generation Squad Weapons (NGSW) program.

The carbine version was developed by SIG Sauer as part of its joint Product Improvement Effort with the U.S. Military. The gun received the official XM8 designation and stock number from the U.S. Army in March, according to Soldier Systems.

The XM8 trims one full pound off the M7’s 8.3-pound heft. Its shorter barrel contributes to the weight savings, along with modifications to the upper receiver.

“The XM8 is just over 32 inches long overall, compared to 37 inches for the M7, with a barrel length dropped from 13 to 11 inches and its suppressor from 7 to 6 inches,” SIG Sauer product manager for rifles and suppressors Joshua Shoemaker told Task & Purpose. Other enhancements include a handguard that’s more rigid and softer recoil pad.

Its 6.8×51 mm chambering remains identical to its big brother and the M250 Automatic rifle, which was also introduced with NGSW. The XM8 wears a telescoping buttstock, rather than the M7’s side-folder.

Complete adoption of the M7/XM8 platform by all branches of the U.S. military is not in the near future, however, if ever. “The Marines have decided to stick with the M27 Infantry Automatic Rifle instead of switching to the Army’s M7 Next Generation Squad Weapon Rifle,” a spokesperson for the branch told Task & Purpose in February.

The new carbine’s label has fueled some confusion among those who remember Heckler & Koch’s submission for U.S. military trials earlier this century. It was also dubbed the XM8 for testing, but the guns are unrelated and do not share the same chambering.

story about that H&K submission appeared in American Rifleman in 2005, and explains, in “October 2003, the first 30 were sent to Aberdeen, Md…This modular family was first built and tested in the 5.56×45 mm, but it can also easily be adapted for the new Remington 6.8 mm SPC.”

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You have to be kidding, right!?!

The Billy-Can Rules By John Connor

When the world comes down to a lone fire on a nameless stream, The Billy-Can Rules make a lot of sense.

“Aussies can be strange folks, especially when it comes to understanding us “Yanks.” For one thing, they seem to think all Yanks know each other, or at least, we know someone who knows the other Yank. For another, they apparently believe all Yanks have some deep need to regularly interact with other Yanks like, “to talk Yank, you know, and discuss Yank things.”

When my clearance to visit a remote Australian military facility failed to arrive at the last minute, my hosts quickly solved the problem of what to do with me, stuck outside the gate for four days while they were inside, training. They couldn’t even leave me their vehicle, and we were miles from nowhere.

“No worries, mate!” they happily cried. “We know a Yank, just like you, who lives rather nearby! He’ll gladly put you up, there’s drink and tucker aplenty, and you’ll have a grand time talking Yank with him and all!”

I had this fleeting vision of a rich expatriate American who maintained a sumptuous outback residence, where he enjoyed his brisk pink gin chilled by ice from a generator-powered freezer. I could almost hear the creak of a hammock in the shade, bearing my big fellow-American butt. Then they popped my bubble.

“Oh, this chap’s a character, all right,” they said as we bounced over sun-scorched rocks. “He’s a sort of modern-day swagman, you see; renounced civilization and lives on half o’ nothin’. To say he’s gone bush wouldn’t be correct; gone feral is more like it. Says he’s ‘mapping the billabongs of Australia, 100 meters per year.’ He’s been at it dog’s years, he has, and still working on the first one.”

Waltzing Matilda, Indeed

They all laughed. I didn’t. The scent of cold pink gin vanished, along with my visions of a spacious Victorian manse. My imaginary hammock collapsed. They musta picked up on my change of mood, and reassured me.

“Ow, it’s not bad, Connor,” Bruce No. 2 said, going serious and furrow-browed. “No crocs in his waters, so you can even bathe, and he’s a bluidy marvel at comin’ up with tucker; roots and fruits, the odd snake for roasting, simply buckets of fish, and he cooks ’em all, you know, none of this sushi business.”

“Ow, right,” added Bruce No. 3, puffing his pipe, “Cooks everything in one billy-can, he does; I’ve seen it.” My vision was revised to something more like a one-man Somali refugee camp. We arrived.

There was a billabong — a small one, but flowing, not stagnant — and about a four-acre backwater where the spiny snouts of what looked like hundreds of alligator gar were cutting the surface, sucking in thousands of some kind of pinwheeling bugs whose papery wings made them look like cherry blossoms falling to the water.

On the sandspit separating billabong from backwater sat Methuselah, stirring something in a smoke-blackened can — his “billy” — over a fire. A half-dozen loaves of “stick-bread” were plumped and browning. It smelled glorious.

“Knew you were coming,” he said. “Hope you’re hungry.” The “Aborigine Grapevine” is faster than wireless. The billy held tender chunks of pre-seared fish fillets in a light seasoned cream sauce. I may be just a dumb grunt, but that superb meal, served in the outback by a dude whose only clean possession was his sparkling spectacles, was the clue to open my head-valve and learn something.

Outback Style

First thing I learned was those fish weren’t alligator gar. “Atractosteus spatula,” Mr. M explained, “Is native only to the Southeastern US. There are Asian gar, of course, but these seem even more primitive. Tasty, aren’t they?”

I learned he was a prodigy graduate of an Ivy League university holding twin Master’s degrees; at one time the VP of a giant metal fabricating corporation, and for several years the ghost-writer of a political analysis column. Along the way he took cooking classes from famous chefs.

His transformation to swagman status was occasioned by an uncontrollable gambling habit and politically-induced nausea: Washington made him ill. His world was global, complex, and ultimately sickening. He underwent “Zen reduction.”

Mr. M reduced his world to a campfire on a nameless outback stream. He reduced data-input to an occasional book; restaurants, cafés and dinner parties to cooking in one battered billy made from a discarded olive oil tin. And around that billy-can, he constructed a politico-legal analytical model: The Billy-Can Rules.

It’s Probably OK

“Everyone has known a Billy,” he began. “Christened William, but he’s always been Billy, and even in middle age, he sticks out his hand and grins, ‘I’m Billy. Pleased ta meetcha.’ He’s not educated, but he’s not stupid, and is often the only one around who can repair a washing machine, fix a microwave, and align a satellite dish properly.

“He’s the guy who hears your battery dying in the driveway and comes over with his truck and jumper cables. Helping you makes him late for work, but he waves it off with ‘S’wat friends are for, ain’t it?’ You don’t think of him as a friend, but he always treats you as one.

“Billy works with his hands by choice. He likes machines, grease, dogs and most people. He’s a veteran without medals, a patriot without pretense; the purest salt of America’s earth. Without people like him, the rich, famous and powerful elite would not possess the freedoms — or consumer base — which allows their successes. In our socioscape Billy is simply overlooked.

“Billy is — or should be — the ultimate arbiter of what makes sense, legally, politically and socially. He may not approve of every new law, policy or public position, and that doesn’t matter much; universal consensus is unrealistic. The question is, can Billy understand it? The rationale behind it? The essential why?

“If he does, that’s good — for the people and the nation. If he doesn’t, it’s bad; bad law, bad policy, bad news for all of us. Everything goes in the billy-can. The only truth is what comes out — what we have to digest. Zen-simple, young soldier.”

Can Billy?

I’ve asked myself a thousand times — Can Billy understand Social Security benefits for illegal aliens? Shipping our skills and materials overseas to those who might shoot them back at us? Billion-dollar “trailers” on million-dollar appropriations bills? “Uncommitted super-delegates” in elections? Disarming peasants and coddling criminals? Fill in your own blanks, folks. I do every day — and everything goes in the billy-can.

This story may seem like a long, winding path leading to a minimalist, enigmatic ending. It is. Put it in your billy-can, stir, and taste.

Connor OUT