No. The CMMG Ambi Mag Catch is a true drop-in replacement that uses the existing magazine catch hole in any mil-spec AR-15 or M16 lower receiver. Installation involves removing your existing magazine catch assembly and installing this one in its place — no drilling, milling, or permanent alteration of any kind.

No. The AR-10 and LR-308 platform use a different magazine catch geometry than the mil-spec AR-15. This catch is designed specifically for AR-15 and M16 pattern lowers. If you have an AR-10 or .308 build, look for a magazine catch designed for that specific pattern.

CMMG designed the left-side paddle to sit low-profile against the receiver rather than protrude significantly. The profile is comparable to other ambi mag catches on the market and should not present snagging issues with most holsters, chest rigs, or slings. As with any ambidextrous control, we recommend confirming holster and accessory clearance with your specific setup before relying on it in the field.

Yes. Right-handed shooters retain the standard right-side release button they are used to. The addition of the left-side paddle also means right-handed shooters can activate a mag drop with their support-side thumb without breaking their firing grip — a technique some shooters prefer for faster reloads. The ambi catch simply adds options without removing any existing functionality.

Magazine catch swaps are one of the more approachable AR lower parts installations. You will need a magazine catch installation tool or a non-marring punch to compress the spring and thread the catch. A basic AR armorers kit covers everything needed. If you are new to AR lower work, there are a number of clear video walkthroughs available, or any gunsmith can install this in a matter of minutes.