Single-Stack vs Double-Stack for Concealed Carry: Width vs Rounds

Three magazine layouts, explained

The difference is how the rounds sit inside the magazine.

• Single-stack: rounds sit in one straight column. The magazine, and the grip around it, are as thin as they can be. Capacity is limited by height.
• Double-stack: rounds zigzag in two staggered columns that funnel into one at the top. More rounds per inch of height, but a wider grip.
• Stack-and-a-half: a partial stagger, wider than a single column but narrower than a full double. It's the design behind most modern micro 9s.

Our extended magazines piece is about reloads and capacity extensions. This guide is about the frame-width decision you make when you choose the gun.

How this was put together: To keep numbers comparable, the table below uses one manufacturer's published specs for three of its carry guns. We haven't measured or tested these pistols ourselves.

The numbers: one maker, three layouts

Glock makes a clean comparison possible because it builds all three layouts in 9mm with nearly the same barrel length. All figures are from Glock's U.S. spec pages.

Three things jump out:

1. The 43X costs almost no width over the 43. Four hundredths of an inch for four more rounds. It gets those rounds mostly by being taller in the grip.
2. The double-stack G26 is the shortest of the three, with ten rounds in a grip shorter than the 43X's. It pays for that in width and weight.
3. Width and height hide differently. Width shows at the waistband. Grip height shows through your shirt when you bend. Which one matters more depends on your body and carry position.

True single-stacks: the slimmest option

The original slim 9s, the Glock 43 and the first-generation S&W M&P Shield among them, carry six to eight rounds in a single column. Ammunition Depot lists 7- and 8-round S&W M&P Shield 9mm magazines, for example, which is typical for the class.

Best for: very slim builds, deep concealment, people who carry in a pocket or ankle holster, and anyone with smaller hands who finds wider grips hard to wrap. Skip if: capacity is a priority and a few hundredths of an inch won't matter to you; stack-and-a-half guns have largely overtaken this class for new buyers.

One honest point in their favor: a thin single-stack grip is easier for some hands to control, because the fingers wrap further around the frame.

Stack-and-a-half: why it took over

Stack-and-a-half guns like the Glock 43X and 48, the Sig P365 family, the Springfield Hellcat and the S&W Shield Plus are the center of today's carry market. They keep most of a single-stack's slimness while holding ten to fifteen rounds.

The Shield Plus is a good example of the evolution: it fits more rounds into a frame close to the original Shield's footprint. Ammunition Depot lists the M&P Shield Plus 9mm with 10- and 13-round magazines, and the 13-round OEM Shield Plus magazine separately. Our Shield Plus buyer's guide covers the gun in depth.

For Glock fans, the 43X is the most direct comparison point; Ammunition Depot carries the G43X with a 15-round configuration. If you're comparing across brands, our P365 vs Hellcat Pro breakdown covers two of the leaders.

Best for: most people choosing a first or only carry gun. Skip if: you need the absolute thinnest gun, or you have room for a compact and want the easier shooting that comes with more grip and weight.

Double-stack compacts and subcompacts

A double-stack subcompact like the Glock 26 trades width for a short grip and the option of longer magazines. Glock lists optional G26 magazine capacities from 12 up, and because the G26 accepts the longer double-stack 9mm Glock magazines, it can share spares with a G19. Ammunition Depot's Glock 26 magazine section lists 10- and 12-round options, including Glock factory 12-rounders.

Step up to a compact like the Glock 19 and you're in a different class: about 15 rounds and a full grip. Our Glock 48 vs Glock 19 comparison is the classic width-versus-capacity decision at that size.

Best for: carriers who want a short grip and the ability to use larger spare magazines. Skip if: width at the waistband is your main printing problem.

How width actually affects concealment

A tenth of an inch sounds trivial, and on paper it is. In practice, width matters most in three situations:

• Inside-the-waistband carry with tight pants. Every bit of width pushes your waistband out.
• Appendix carry on a lean build. There's little body to fill in around the gun.
• Pocket and ankle carry. Width shows directly through fabric.

For strong-side carry on an average build with a good holster and belt, grip height often matters more than width, because the grip is what pushes against the shirt when you bend or reach. That's why some people find a G26 hides better than a 43X, and others find the opposite.

Holster choice can change the picture. A claw or wing that tucks the grip in can make up for a lot of width. The DeSantis Mean Streak IWB for the Shield 9/40 is one example of a model-specific slimline holster.

Shooting differences

We won't put numbers on recoil, but general principles hold. More weight soaks up more recoil, so the heavier G26 tends to feel softer than the lighter 43. More grip length gives your hand more to hold, which helps the 43X. And grip circumference affects how fully your fingers wrap; that's personal. Our micro 9 recoil guide covers technique for all three.

Spare magazines and the layout you pick

Your magazine layout also decides what spares cost you in pocket or belt space. A single-stack spare is the flattest thing you can carry. A stack-and-a-half spare is a little thicker but holds several more rounds. A double-stack spare is the bulkiest, though on a G26 you can carry a longer G19 magazine as the spare for extra rounds. If you carry a spare, and many instructors suggest you do, factor its size into the decision; our extended mags piece covers the reload side.

How to choose

• Choose a true single-stack if you need the slimmest possible gun or have small hands and find wider grips hard to control.
• Choose stack-and-a-half if you want the best mix of capacity and slimness, which describes most carriers.
• Choose a double-stack subcompact if grip height is your printing problem and width isn't, or you want to share magazines with a bigger gun.
• Choose a compact if you can hide it; it's the easiest of all to shoot well.

Editorial note: This is an independent editorial overview built from manufacturer specifications, retailer listings and published sources. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and the law where you live.

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.