Description
The AR-15 was built around right-handed operation for decades, and if you run your rifle southpaw or just want faster reloads, the standard mag button can feel like an afterthought. CMMG's Zeroed ambi extended mag catch fixes that by bringing the ambidextrous operation of their original ambi catches together with an extended-release bar that gives you noticeably more leverage. You get a mag drop from either side of the receiver without fighting your grip.
What the Zeroed Ambi Mag Catch Kit Actually Adds
The extended-release bar is the star here. It reaches out past a standard button so you can trip the release without breaking your firing grip, which is a real advantage if you have smaller hands or run a finned grip. The extension is machined from steel with a serrated surface, so your thumb finds it and stays put even with gloves on or sweaty hands at the range. It's the kind of upgrade that feels small until you run a few mag changes and wonder why you waited.
Fit and Install on Your AR-15
This kit works with mil-spec AR-15 and M16 lowers and installs the same way your factory mag catch does. It plays nice with both mil-spec and aftermarket mag release buttons, and it doesn't change your magazine compatibility, so your PMAGs and metal mags keep dropping free. Installation is about as simple as it gets: thread the adapter button into place, then attach the button extension to the adapter and you're done. Most folks have it swapped in a matter of minutes with basic tools.
Built the CMMG Way
CMMG has a strong reputation for parts that just work, and the fit and finish on this one lives up to it. The all-steel construction means it holds up to hard use, and the whole kit is backed by CMMG's Lifetime Quality Guarantee. If you're building out a rifle for defensive use, competition, or just want more control at the range, this is a straightforward way to make your reloads faster and more intuitive from either hand.
Key Specifications
- Manufacturer: CMMG
- Model: Zeroed
- Manufacturer Part Number: 55AFF89
- UPC: 810046234839
- Platform: AR-15 / M16
- Hand: Ambidextrous
- Material: Steel
- Extension Surface: Serrated for traction
- Color: Black
- Button Compatibility: Mil-spec and aftermarket mag release buttons
- Warranty: CMMG Lifetime Quality Guarantee
What’s Included
- Extended-release bar
- Mag release button
- Mag catch
- Mag catch spring
Frequently Asked Questions
Will the CMMG Zeroed ambi mag catch kit fit my AR-15?
Yes. It's designed for mil-spec AR-15 and M16 lowers and installs in the same spot as your factory mag catch. It works with both mil-spec and aftermarket mag release buttons, so it drops into most standard builds without extra fitting.
Do I need a gunsmith to install this ambi mag catch and button kit?
Not at all. Installation is simple: thread the adapter button into place, then attach the button extension to the adapter and you're finished. Most owners have it swapped in a few minutes with basic hand tools.
Does the extended-release bar change my magazine compatibility?
No. The Zeroed kit keeps standard magazine compatibility, so your PMAGs and metal mags still seat and drop free like they did before. The extended bar simply adds leverage and reach for the release itself.
Is this a good option for left-handed shooters?
Absolutely, that's exactly who it was built for. The ambidextrous design lets you drop a mag from either side of the receiver, and the extended-release bar gives lefties an easy-to-reach release without breaking their grip. Righties benefit too, especially with smaller hands or a finned grip.





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