Extended Magazines for Carry Guns: Think Reload, Not Capacity

The magazine in your gun decides how it conceals. The one in your pocket decides how long you can keep shooting. They do not have to match.

The usual instinct, and a better one

When people think about extended magazines for a carry pistol, they usually picture putting one in the gun. More rounds on board, simple. The consequences are less simple. A longer magazine hangs below the grip, adds weight at the bottom of the pistol and gives the whole package a different outline against your body.

There is a better arrangement for a lot of carriers: use a short or flush magazine in the pistol, where concealment matters, and carry a longer magazine as the spare, where length matters less. This is the argument of the title. The pistol's magazine decides how it conceals; the spare is for reloading and recovery, not for printing.

Why the spare is the right place for size

Consider what a spare magazine is for. It is a reload after you have fired the magazine in the gun, and it is a fix for some malfunctions where swapping magazines clears the problem. Neither use needs the spare to look like the magazine in the pistol.

A bigger spare, carried on the belt or in a pocket, has two advantages:

• It holds more rounds in the part of the system that does not print. You get capacity without changing the gun's silhouette.
• It stays out of the way of the grip. The pistol's grip is how the gun is held, and that matters for control.

It also has some costs. A longer magazine takes up more space in a pouch or pocket, may be harder to conceal in some clothing, and requires practice to load smoothly. And remember the rule of thumb: the spare must be as reliable as the one in the gun, which means tested.

Two examples from our product list

Magpul PMAG 21 GL9 for Glock pistols

The Magpul PMAG 21 GL9 is a 21-round 9mm magazine designed for Glock pistols. In a compact like the Glock 19, a 21-round magazine extends well below the grip, so it is a poor choice to carry in the gun. As a spare, it is a defensible way to add capacity. We have not tested the PMAG, so we won't make claims about its reliability. What we can say is that you should check it for compatibility with your exact Glock model, confirm it is legal where you live, and test it with your carry ammunition.

For the pistol itself, see our Glock 19 Gen5 carry review.

Sig P365 extended 12-round magazine

The Sig P365 Extended 12-round is a larger magazine for the P365 platform. Unlike a Glock, a micro pistol often benefits from a longer magazine because it gives your pinky a place to rest. That makes the argument more nuanced: for some hands, the extended magazine improves the grip and the control of a tiny pistol, so you may prefer it in the gun. For others, the extra length undoes the concealment advantage of a micro.

Sig's family of P365 pistols includes several models with different magazine compatibility. Confirm the listing against your exact pistol. Our P365 upgrade path and the P365 vs XL vs XMACRO comparison discuss how the family fits together.

A quick reference

How to test a magazine you plan to carry

1. Inspect the magazine. Check the feed lips, spring and follower for damage.
2. Load it to full capacity. Some magazines are reliable only if loaded below capacity; know your results.
3. Fire it in the pistol with your carry ammunition. Note any stoppages.
4. Label it. Mark carry magazines and keep them separate from practice magazines.
5. Retire any that fail. One failure is a reason to scrutinize; repeated failures are a reason to retire.

Legal check

Magazine capacity limits exist in some states and municipalities. They vary in the maximum capacity, the exceptions, and whether possession of existing magazines is grandfathered. Before you buy a high-capacity magazine, check your state's rules and the rules of any place you will travel. Our permitless carry explainer is a reminder that carry laws differ widely, and the same is true for magazines.

Practical considerations

• Reloading practice. Practice swapping magazines with the gun unloaded and verified safe.
• Carry position. A longer spare may require a belt pouch rather than a pocket.
• Weight. A loaded magazine adds weight, and a big one adds more. Try your setup for a day before settling on it.
• Consistency. Always carry the spare in the same place.

Costs that do not show up on the listing

An extended magazine has costs beyond its purchase.

• A new pouch or carrier. A longer magazine may not fit the pouch you own. Pouches are model- and length-specific, and a longer mag may need a different cant or position.
• Different reload practice. The magazine is longer, so the motion to seat it is slightly different. Practice with dummy magazines or unloaded pistols until it is smooth.
• Capacity limits. If you travel to a state that limits capacity, your magazine may be illegal there, and you must plan for that.
• Heavier spare. Every cartridge adds weight, and a full 21-round magazine in a pocket tugs at fabric.
• Wear. Spring tension over time matters for any magazine, loaded for long periods or not. Inspect and rotate your magazines.

None of these is a deal breaker. They are the reason to think of a longer magazine as part of a system, not a single accessory.

Caring for magazines

Magazines are the most common reason for stoppages in semiautomatic pistols, which makes them worth maintaining. Clean them periodically according to the manufacturer's instructions, check the feed lips for cracks or bending, and look for corrosion on the spring and follower. Rotate the magazines you carry so none sits compressed for years. Retire any that show damage, and keep carry magazines separate from range magazines so you know their history. A spare that has never been shot is a spare you do not know.

Should you buy one?

An extended magazine is worth a look if you already carry a spare, you know your local law, and you accept the need to test. It is not worth buying if you won't carry a spare or you haven't settled your holster and carry position. Gear that does not support your actual routine tends to end up in a drawer.

Editorial note: This is an independent editorial overview built from manufacturer specifications and publicly available information. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and legality for your own situation.

Affiliate disclosure: Some links on this page are affiliate links to Ammunition Depot. We may earn a commission if you buy through them, at no extra cost to you. Our editorial choices are not influenced by commissions. Check current price, stock and specifications directly with the retailer.