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The key is the shape of the 5.7 casing. The round is necked down, but it isn't tapered. By not tapering, this allows one round to stack nicely against another without contributing to stack-curvature. Contrast that to the .22LR that has a protruding rim. Stack those together and you can quickly see that traditional 'banana' curve ((. Also why most 'hi-capacity' .22LR mags have no more than 25 or 26 rounds.

FN's companion side arm, the FiveSeven, has 20 rounds in the same grip space that normally holds 17 rounds of 9mm (another non-tapered round).

The last reason the P90 can hold so many rounds is due to clever engineering of the magazine. Since the P90 was designed as a Personal Defense Weapon, it needed to be compact and easily operated in tight spaces, such as a vehicle. A long protruding magazine would limit mobility (and not as easy to conceal under a coat--you don't want to frighten those sheep you're protecting!). Therefore, FN engineered a magazine that changes the round's orientation 90 degrees to take advantage of existing real estate: the barrel and stock.

Once the round is turned it reverts to traditional space savings by staggering the stack (think about how most people store Coke cans in their refrigerator these days).

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