Description
This is the Mec-Gar Beretta PX4 9mm 21-round extended magazine, engineered for those who want serious capacity without sacrificing quality. You get one extra round compared to standard factory magazines, which adds up fast when you're at the range or training.
The construction is solid across the board. Inside, you'll find heat-treated carbon steel tubing paired with high-tensile music wire springs that handle repeated use without losing their snap. The anti-friction coating makes loading smooth and cuts down on malfunctions while also protecting against corrosion. The polymer follower is designed to keep rounds properly aligned as they feed into the gun, and rear witness holes let you see your remaining capacity at a glance.
The extended polymer floorplate gives you better grip purchase when seating the magazine and makes it easier to catch during reloads. All the internal components are interlinked for consistent, reliable performance. Mec-Gar has been making magazines since 1965 and supplies magazines for major firearm manufacturers worldwide, so you know what you're getting here is built to last.
One important note: this magazine is not compatible with funneled magazine guides, so check your setup before ordering.
Key Specifications
- Manufacturer: Mec-Gar
- Manufacturer Part Number: MGPBPX421AFC
- UPC: 765595512108
- Compatible Firearms: Beretta PX4 (all frame sizes)
- Caliber: 9mm Luger
- Capacity: 21 rounds
- Tube Material: Heat-treated carbon steel
- Spring: High-tensile music wire
- Follower: High-impact polymer
- Coating: Anti-friction
- Floorplate: Extended polymer
- Color: Black
- Features: Witness holes, internal linkage, extended capacity
What’s Included
- 1x Mec-Gar 21-round magazine
Frequently Asked Questions
Will this 21-round PX4 magazine work with all versions of the Beretta PX4?
This magazine is compatible with all Beretta PX4 frame sizes including the full-size, compact, and sub-compact models. However, the extended floorplate will stick out noticeably on compact and sub-compact guns. The magazine feeds and functions fine, but the ergonomics and appearance differ depending on your PX4 variant.
What does anti-friction coating do?
The anti-friction coating makes the magazine easier to load, reduces the risk of malfunctions, and protects the steel parts from rust and corrosion. This coating improves the overall reliability and lifespan of the magazine, especially if you rotate it regularly through your range magazines.
Can I use this magazine with funneled magazine guides?
No, this magazine is not compatible with funneled magazine guides. Check your pistol's magazine well setup before purchasing. If you have a funneled guide installed, you'll need a different magazine or remove the guide.
How does Mec-Gar's reputation compare to factory Beretta magazines?
Mec-Gar has been producing magazines since 1965 and supplies factory magazines to major firearm manufacturers worldwide, including Beretta. Many consider their magazines to be equal or superior to factory equivalents in terms of durability and reliability, and they're often more affordable.
Are the witness holes accurate for counting rounds?
Yes, the rear witness holes are numbered and designed to let you quickly see how many rounds remain in the magazine without removing it. This is helpful for training and ensuring you're fully loaded during practice sessions.
How many rounds come with this magazine?
This is a single magazine that holds up to 21 rounds of 9mm ammunition. If you need multiple magazines, you'll need to order additional units separately.




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