Introduction: Clearing Up the Confusion
Let’s face it—there’s a lot of confusion around the AR15 Swift Link and the Auto Sear. They sound similar, they both install into an AR15 lower, and you might even hear both mentioned in the same conversation about performance or conversions. But here’s the thing: these are two very different components, both in function and legality.
If you’re shopping around or just trying to make sense of what you’ve seen in forums or YouTube videos, this guide will break it all down clearly. We’ll cover how the AR15 Swift Link works, how it compares to an Auto Sear, and most importantly—what’s legal, what’s not, and what you need to know if you’re considering either.
What Is an AR15 Swift Link?
The AR15 Swift Link is a small, non-permanent upgrade that fits inside the lower receiver of an AR15. Its main purpose is to improve the fit and tension between the upper and lower receivers. When installed properly, it reduces wobble and enhances the rifle’s accuracy by creating a tighter seal between both halves of the firearm.
This results in a more stable shooting experience, better shot-to-shot consistency, and an overall improvement in how the rifle feels and performs. Think of it as a structural upgrade—not a fire-control mechanism. It doesn’t convert your AR15 into full-auto and doesn’t interfere with your trigger group’s original function.
It’s popular with precision shooters, builders, and those who like their rifles tight and responsive. At AutoSear.org, we recommend it as a practical, legal enhancement for anyone serious about performance.
What Is an Auto Sear?
An Auto Sear, on the other hand, is an entirely different beast. This is a mechanical component designed to enable fully automatic fire in select-fire AR-style rifles. When combined with a full-auto bolt carrier group and other select parts, the Auto Sear modifies the fire control group so that the rifle continues firing as long as the trigger is held.
Here’s where it gets serious: Auto Sears are regulated by the National Firearms Act (NFA) and are considered machine gun components by the ATF. That means owning one without proper licensing is a felony. It doesn’t matter if the part is installed or just sitting in your toolbox. If it’s in your possession and your AR15 can be converted with it, you’re in dangerous legal territory.
Unlike the Swift Link, which is purely a fitment aid, the Auto Sear alters how the rifle fires. That’s the legal difference, and it matters.
Legal Breakdown: Which One Can You Own?
- AR15 Swift Link: Legal in most states and considered a performance accessory. It does not change the firing mechanism. Always check your local laws, but in general, it’s legal to purchase, own, and install.
- Auto Sear: Classified as a machine gun part under federal law. Illegal to own without proper licensing (Class 3 / SOT). Possession can lead to federal charges, even if it’s not installed.
In short, if you’re looking to stay 100% legal, the Swift Link is the safe, smart option. Auto Sears are reserved for licensed entities, law enforcement, and the very few civilians with transferable pre-1986 models (and those sell for tens of thousands of dollars).
Performance Differences: What Do They Actually Do?
| Feature | AR15 Swift Link | Auto Sear |
|---|---|---|
| Enhances accuracy | ✅ Yes | ❌ No |
| Allows full-auto fire | ❌ No | ✅ Yes |
| Legal for civilians | ✅ Yes | ❌ No (without license) |
| Modifies fire control group | ❌ No | ✅ Yes |
| Improves upper/lower tension | ✅ Yes | ❌ No |
The Swift Link gives you a better shooting feel. The Auto Sear changes the fundamental operation of the firearm.
Glock Switches and Legal Similarities
This same legal line is what makes items like the Glock switch (a full-auto selector plate for Glock pistols) heavily regulated. While you might see Glock switches for sale online, the same rules apply as with Auto Sears: possession without proper paperwork can result in criminal charges.
That’s why platforms like AutoSear.org only deal with legal, performance-focused parts. Whether you’re upgrading your rifle or just exploring accessories, always make sure you know the difference.
Conclusion: Make the Right Choice
If you’re looking for better control, stability, and accuracy from your AR15, the AR15 Swift Link is a legal, effective option that gives you exactly that. It won’t get you in trouble, doesn’t require special paperwork, and makes your rifle feel more dialed in.
Avoid falling into gray areas. Stick with parts like the Swift Link that improve your shooting experience without crossing legal lines.
Ready to upgrade your rifle safely and legally?
Order your AR15 Swift Link today at AutoSear.org and shoot with confidence.