If you've spent any time at all around vintage military firearms, you probably know that 1917 half moon clips are the tiny, stamped pieces of steel that basically saved the American side of the Great War from a massive logistics headache. It's funny how such a simple, cheap little bit of metal can be the difference between a functional sidearm and a very expensive club. If you own an M1917 revolver today—whether it's the Smith & Wesson or the Colt version—these clips aren't just a "nice to have" accessory; they are the heart of the whole shooting experience.
The weird problem these clips solved
Back in the day, around 1917, the U.S. military was in a bit of a bind. They'd just entered World War I and realized they didn't have nearly enough M1911 semi-auto pistols to go around. Production couldn't keep up with the millions of troops heading overseas. The obvious solution was to use revolvers, but there was a catch: the standard military round was the .45 ACP, which is a rimless cartridge.
Revolvers are built to fire rimmed cartridges like .38 Special or .44 Magnum. The rim stops the bullet from sliding too far into the cylinder and gives the extractor something to grab onto when you want to get the empty brass out. If you just drop a .45 ACP round into a revolver cylinder, it might fire if the headspace is right, but good luck getting it back out without poking it with a pencil or a stick.
That's where the 1917 half moon clips came into play. Joseph Wesson, of Smith & Wesson fame, came up with the idea to clip three rounds together. This gave the rimless rounds a "fake rim" to headspace on and, more importantly, gave the revolver's star extractor something to push against. It was a brilliant, low-tech fix for a high-pressure problem.
Half moon vs. full moon clips
I get asked a lot why someone would bother with half moon clips when "full moon" clips (which hold all six rounds) exist. It's a fair question. Full moon clips are definitely faster for a "speed reload" because you're dropping everything in at once. However, the original 1917 half moon clips have some charm that people overlook.
First off, they're way easier to carry in a pocket. A full moon clip is a big, circular, floppy mess that bends easily if you sit on it. Two half moon clips, on the other hand, sit relatively flat. Back in the day, soldiers would keep them in pouches or even just loose in their tunics.
There's also the ease of loading. Snapping three rounds into a clip by hand is significantly easier than trying to wrestle six rounds into a full moon clip. If you've ever tried to load a stiff full moon clip without a tool, you know the literal pain I'm talking about. Your thumbs will be screaming at you by the third one. Half moons have a bit more "give," making them much friendlier for a casual day at the range.
The "tactile" experience of shooting with clips
There is something incredibly satisfying about the clink of 1917 half moon clips hitting the ground. When you open the cylinder of an old M1917 and hit that ejector rod, the empty brass doesn't just tumble out individually. Instead, you get two neat little packages of three. It's clean, it's fast, and it makes you feel like you're actually handling a piece of history.
I've found that using these clips actually changes how you think about reloading. You become very aware of the "three-and-three" rhythm. It's also a great conversation starter at the range. Usually, someone in the next lane will look over and say, "Wait, what are those things?" It's a gateway into explaining how the military handled logistics a century ago.
Keeping your clips in good shape
If you're using original or even modern reproduction 1917 half moon clips, you have to treat them with a little bit of respect. They aren't indestructible. The most common issue I see is people bending them. If a clip gets even slightly tweaked or warped, it can cause the cylinder to bind. You'll go to pull the trigger, and it'll feel like the gun is jammed because the back of the clip is rubbing against the frame.
Here are a few tips I've picked up over the years: * Don't force them: If a round doesn't want to snap in, check the clip for debris or a burr. * Check for flatness: Lay the clip on a glass table or a flat workbench. If it wobbles, it's bent. You can sometimes tap them flat with a plastic mallet, but usually, it's better to just toss it and use a fresh one. * The Demooner Tool: Honestly, save yourself the headache and buy a "demooner" tool. It's basically a small tube that twists the brass off the clip. Using your fingers works in a pinch, but after about twenty rounds, you'll wish you had the tool.
Where do you find them today?
The cool thing is that 1917 half moon clips are still being made. You don't have to scour eBay for rusty 100-year-old relics (though those are cool for a display case). Companies like Wilson Combat and Ranch Products still pump these out because people still love shooting their old S&Ws and Colts.
Even some modern revolvers, like the Smith & Wesson 625, can use them. While that gun is designed for full moon clips, the old-school half moons work perfectly fine in them too. It's one of those rare cases where a design from 1917 is still perfectly functional and relevant in the 21st century.
Is it worth the hassle?
Some people find clips to be a bit of a chore. You have to load the clips before you go to the range, and then you have to strip the brass off them when you're done. It's an extra step that you don't have with a standard .38 Special revolver.
But for me, that's part of the fun. It's a ritual. Sitting at my desk on a Friday night, snapping .45 ACP rounds into 1917 half moon clips while I prep for a Saturday morning shoot, is strangely relaxing. It connects you to the machine. You aren't just dumping bulk ammo into a plastic tray; you're prepping a mechanical system.
Plus, there's the performance aspect. You can reload an M1917 with clips faster than almost any other revolver using loose rounds. It was the "speedloader" before speedloaders were even a thing.
Final thoughts on the humble clip
At the end of the day, 1917 half moon clips represent a classic era of American ingenuity. We had a problem—not enough pistols—and we solved it with a simple piece of spring steel. They turned two different revolvers from two different manufacturers into a unified weapon system that saw action in two World Wars.
If you own one of these old "war horses," do yourself a favor and get a big bag of clips. Don't just buy two or three; buy fifty. They're cheap, they're essential, and they make shooting one of the most historically significant handguns in the world a total blast. Just remember to bring a tool to get the brass off, or your thumbs are going to hate me by the end of the day.