Description
Already running a Magpul MS1 sling and wishing you could switch between one-point and two-point on the fly? That's exactly what this adapter is built for. Pair it with your MS1 and an additional QD sling swivel, and you get the stability of a two-point plus the freedom of a one-point in a single setup, with clean one-handed transitions between them. It's the same setup that gives Magpul's MS4 sling its name, so you're essentially upgrading what you already own instead of buying a whole new sling.
The hardware is where this thing earns its keep. The QD D-ring is precision-cast steel finished with QPQ salt bath nitride, which shrugs off wear and corrosion better than a standard coating, while the heavy-duty push-button QD sling swivel carries a manganese phosphate finish. That swivel drops into the QD cups you'll find on most lower receivers, receiver end plates, and buttstocks, so compatibility is rarely an issue. The webbing is custom 1.25-inch nylon, snag-free and anti-chafe, and the Coyote-colored version carries a near-infrared treatment to cut down IR signature.
Why the MS1/MS4 Adapter Beats Buying a New Sling
If you've got an MS1 or even an MS3, this adapter converts it rather than replacing it. Folks who run Blue Force and other two-point slings have swapped hardware over to this setup in a couple of minutes and never looked back. The ambidextrous QD shackle also means you can bail out of the sling quickly in an emergency, which is a real consideration for anyone using their rifle in tight spaces or transitioning shoulders.
Coyote MS1/MS4 Adapter Build Notes
Everything here is made and engineered in the USA. The mix of nitride-finished steel and durable polymer keeps the weight down without giving up toughness, and the Coyote webbing pairs nicely with tan and FDE builds. Add a QD swivel to the front end and you're ready to run it in full two-point mode whenever you want it.
Key Specifications
- Manufacturer: Magpul Industries
- Manufacturer Part Number: MAG519-COY
- UPC: 873750010830
- Model: MS1/MS4
- Product Type: Sling Adapter
- Color: Coyote
- Steel Finish: QPQ Salt Bath Nitride / Manganese Phosphate
- D-Ring Material: Precision-Cast Steel
- Webbing: 1.25 inch Custom Nylon, Snag-Free
- IR Treatment: Near Infrared (NIR) reduced signature
- QD Swivel: Heavy-Duty Push-Button
- Shackle: Ambidextrous QD Quick-Release
- Country of Origin: Made in USA
What’s Included
- Magpul MS1/MS4 Adapter with attached QD D-ring and webbing
- Heavy-duty push-button QD sling swivel
Frequently Asked Questions
What do I need to use the MS1/MS4 Adapter?
You'll want a Magpul MS1 sling and one additional QD sling swivel to unlock full convertibility. The adapter combined with the MS1 lets you switch between one-point and two-point configurations. The included push-button QD swivel handles the one-point attachment, and adding a second swivel up front sets you up for two-point mode.
Will the QD swivel fit my rifle?
The push-button QD swivel is compatible with the QD sockets found on most lower receivers, receiver end plates, and buttstocks. If your setup already has a standard push-button QD cup, this will drop right in. It's the same QD standard used across most modern AR platforms.
Can I use the MS1/MS4 Adapter to convert an MS3 sling?
Yes. Plenty of users swap the clip hook or existing hardware on their MS3 over to this adapter to get MS4-style QD functionality, and it usually takes just a couple of minutes. It also works to convert other two-point slings like Blue Force models over to a QD setup.
Why does the Coyote webbing have a near-infrared treatment?
The colored webbing carries a near-infrared (NIR) treatment that reduces its IR signature. This matters for anyone operating around night vision or IR equipment, where untreated gear can stand out. For everyday range use it simply means a quality, purpose-built material.





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