Gabriel R. Serna
Background and Clarification
Since 2024, there has been widespread concern about a new gun law in Mexico, which was originally just a bill misinterpreted or mistranslated from Spanish. I received many questions and explained that we were addressing the issue, clarified that it wasn’t as reported, and asked for patience.
What’s New as of May 30, 2025?
The reform to the Mexican Gun Law is now in effect. Fortunately, there are no major changes for U.S. sportsmen and women hunting in Mexico with their own firearms.
Firearm and Ammunition Limits
- Number of firearms allowed: Hunters may bring up to two firearms, either two rifles, two shotguns, or one of each, strictly for hunting purposes.
- Ammunition limit: A maximum of 100 rounds per firearm is permitted. Ammunition may only be imported once, at the start of the hunting trip. No additional ammo can be brought back on subsequent entries during the same season.
- Entry and re-entry of firearms: Firearms can be imported and exported multiple times throughout the hunting season, provided that your Mexican gun license is valid for the full duration.
- Customs registration: On each entry and exit, firearms must be registered with Mexican Customs. Even if you’ve registered them previously in the season, you must re-register every time you bring them into or out of the country.
- Ammunition removal: At the end of the hunting season, all firearms and remaining ammunition must be declared and removed from Mexico. Leaving live ammunition in Mexico is strictly prohibited and could result in legal consequences for both the hunter and the ranch owner.
- Caliber limits for rifles: Rifle calibers must not exceed .30” (7.62mm). Bringing firearms with larger calibers may lead to seizure or denied entry.
- Gauge limits for shotguns: Shotguns must be 12 gauge or smaller and may be loaded with up to 00 buck shells; slugs are not permitted. Commonly approved options include gauges such as 16, 20, and 28, as well as .410 caliber, with shot sizes ranging from 00 to #8.
Before Entering Mexico with Firearms
Ensure the following steps are taken before crossing:
- CBP Form 4457 (U.S. Requirement): Complete and present the CBP Form 4457 at U.S. Customs before paying the toll at the bridge or before boarding your flight. This form documents your firearms as your personal property and is required to avoid issues when re-entering the U.S.
- Mexican gun license: Carry your Mexican firearm permit, and verify that:
- Your full name matches exactly as it appears in your passport.
- The address on the permit matches the one on your ID or driver’s license.
- Identification: Bring your passport (or passport card if traveling by land), and carry a photocopy of it in case it’s requested.
- Firearm details: Ensure you have the correct information for each gun:
- Make, model, serial number, and caliber or gauge must be clearly listed.
- Confirm that this information matches exactly what is stamped on the firearm.
- Ammunition inspection: You may only bring 100 rounds per firearm, and the ammunition must:
- Match the caliber/gauge of the listed firearm.
- Have matching headstamps (the marking on the base of the shell must correspond to the barrel stamp).
- Restricted calibers: Avoid bringing custom (wildcat) calibers or reloaded ammunition, as these may not be eligible for import under Mexican regulations.
- Hunting ranch information: Have the following details ready:
- Name of the ranch and the ranch owner’s full name.
- The Mexican state where the hunt will take place — for example, Tamaulipas, Nuevo León, or Coahuila.
- Be aware that hunting seasons and rules may vary by state, including policies for species like hogs.
- License validity: Double-check the start and end dates of your Mexican gun license. Most licenses are valid only during deer season, even if you applied with hog hunting in mind.
Newly prohibited hunting accessories in Mexico include:
- Suppressors
- Night vision sights, including thermal and infrared devices
- Holographic and laser sights
- Any accessory designed to give firearms a military-style appearance
Final Reminders
Now more than ever, coordinate with your ranch owner before travel. At the end of the season, check out firearms and remove all ammo. Always declare everything at Mexican customs.
Further regulations may be introduced. I will keep you updated.
⚠️ Disclaimer: This document is for informational purposes only. It does not constitute legal advice or official guidance. For specific cases, requirements, or changes to Mexican firearms regulations, please consult the relevant authorities or official government publications.