One pull of the trigger. Thirty-three rounds gone in under two seconds.
That’s the reality when you’re wielding a Glock with a switch—a firearm transformed from a semi-auto sidearm to a full-auto machine, capable of unleashing a torrent of 9mm in seconds. But how far can this machine go before it overheats, malfunctions, or needs serious maintenance?
Whether you’re a firearms collector, licensed operator, or curious about the mechanics of full-auto fire, this deep dive unpacks exactly how many rounds a Glock with a switch can shoot, what factors limit it, and how to keep it running reliably.
What Exactly Is a “Glock with a Switch”?
A Glock switch—also called a full-auto sear, selector switch, or conversion device—is a small, backplate-mounted component that modifies the pistol’s internal firing mechanism to allow automatic fire. This means a single trigger pull results in continuous fire until the trigger is released or the magazine runs dry.
- Mechanically, it overrides the disconnector and allows the trigger bar to reset automatically with slide movement.
- Legally, it is classified as a machine gun under the National Firearms Act (NFA), meaning:
- Only law enforcement, military, and individuals with proper Class 3/NFA licenses can possess it legally.
- Unauthorized possession carries severe federal penalties.
At [AutoSear.org], we don’t just sell hardware—we educate. We support legal, informed ownership for licensed individuals and institutions only. how to legally own one
How Many Rounds Can It Fire? Let’s Get Technical
The answer depends on three key variables:
1. 🔫 Rate of Fire
A Glock modified with a switch can achieve a cyclic rate of 1,200–1,600 RPM (rounds per minute), depending on the model, spring tension, ammo type, and recoil buffer.
- Glock 17: ~1,200 RPM
- Glock 19: ~1,300 RPM (shorter slide = faster cycle)
- Glock 18 (factory full-auto): ~1,200 RPM (benchmark)
2. Magazine Capacity
Here’s what that translates to in raw numbers:
| Magazine Type | Rounds | Duration in Full-Auto Mode |
|---|---|---|
| Standard (G17) | 17 | ~0.85 seconds |
| Extended (Glock 18C) | 33 | ~1.65 seconds |
| Drum (Aftermarket) | 50 | ~2.5 seconds |
| Dual-Drum (Rare) | 100 | ~5.0 seconds |
So if you’re asking, “How many rounds can a Glock with a switch shoot?”—the answer depends on how fast you can reload and how long your gun can handle the heat.
Thermal Load & Limitations: The Hidden Enemy
Heat is the number one limiting factor—not ammo.
After ~100-150 rounds in quick succession, your Glock’s barrel and slide will reach critical temperatures (300°F+), risking:
- Cook-offs (cartridge fires from heat, not trigger)
- Slide warping
- Frame melting (polymer frames like the G17/G19)
Here’s a breakdown of heat accumulation:
| Rounds Fired | Estimated Temp (°F) | Consequence |
|---|---|---|
| 30–50 | 150–200 | Manageable heat |
| 75–100 | 200–300 | Hot to the touch |
| 150+ | 300–450 | Risk of permanent damage |
💡 Pro Tip: Use rotating upper kits, compensators, and chrome-lined aftermarket barrels for heat resistance if you’re planning sustained auto fire.
A True Story: “Burnout at the Range”
James, an FFL-holder in Texas, ran a test on a legally converted Glock 17. With six 33-round magazines and a GoPro mounted behind the ejection port, he ran a continuous fire-and-reload cycle.
“By the fourth mag, the frame was so hot it warped slightly. My gloves were smoking. That’s when I knew I pushed it too far.”
He fired 198 rounds in under 15 seconds—but ended up with a melted trigger guard and a seized slide. It’s a reminder: power comes at a price, and full-auto isn’t for casual use.
Full-Auto Wear and Tear: What Breaks First?
If you’re wondering what parts will fail first when pushing your Glock switch to the max, here’s the rundown:
- Barrel – Warps from heat after sustained fire.
- Recoil spring – Fatigues 2–3x faster under full-auto use.
- Trigger group – Higher chance of breakage without polished aftermarket parts.
- Extractor & ejector – May fail prematurely due to rapid cycling.
Maintenance Tips:
- Swap recoil springs every 500 rounds.
- Use synthetic grease on slide rails.
- Let barrel cool every 100 rounds.
- Invest in a threaded barrel with heat shielding if going past 150+ rounds.
FAQ: Your Questions About Glock Switches Answered
Q: Can a Glock shoot unlimited rounds with a switch?
A: No. You’re limited by mag capacity, reload time, and barrel temperature. Most pistols max out safely at ~150 rounds before needing a cooldown.
Q: What happens if I use a drum mag?
A: With a 100-round drum, your Glock will fire continuously for ~4.5 seconds. After that, expect extreme heat and the need for immediate cooling.
Q: Are Glock switches legal?
A: Only for licensed individuals/entities under the NFA. [AutoSear.org] provides assistance for lawful buyers and agencies.
Q: Is a Glock with a switch accurate?
A: At close range (under 7 yards), a trained user can keep groups tight. Beyond that, recoil becomes chaotic without a compensator or foregrip.
💬 Question for You: What Would You Do With a Full-Auto Glock?
If you legally owned a Glock with a switch, would you take it to the range for fun, keep it as a collector’s piece, or train with it for tactical applications?
👉 Let us know how you’d use it—responsibly and legally.
🎯 Final Shot: Want to Buy a Glock Switch Legally? Trust AutoSear.org
Whether you’re an agency needing full-auto sidearms or a licensed FFL looking for the best selection, AutoSear.org is your #1 destination for:
- Glock switches
- Full auto sear parts
- Expert legal guidance
- Collector-grade performance mods
We provide compliant, high-performance options and support with NFA paperwork so you can focus on what matters—owning your swhttp://autosear.orgitch legally and safely.
🔗 Visit [AutoSear.org] today to explore your options or start your compliance journey.
