Description
A-Zoom 5.7×28 Snap Caps are machined aluminum dummy rounds in 5.7x28mm, five to a pack. This is a small bottleneck cartridge feeding from tall, high capacity magazines, which is a combination that rewards a proper function check rather than an optimistic one.
How A-Zoom 5.7×28 Snap Caps Are Built
Each round is CNC machined from solid aluminum billet to the exact dimensions of a loaded cartridge and hard anodized. One piece, no separate case head, no plastic body. A bottleneck pistol cartridge this small leaves almost nothing for a two-piece dummy to hold onto, so a machined solid is the only sensible construction.
The primer end carries a proprietary polymer cushion instead of a live primer, rated by A-Zoom past three thousand strikes. It decelerates the firing pin much as a real primer would rather than letting it stop hard against the breech face.
Because A-Zoom 5.7×28 Snap Caps match loaded cartridge dimensions, they stack in a magazine, feed and extract like real ammunition, which is exactly what you need when the question is whether the magazine works.
Why 5.7 Pistols Want Dummy Rounds
The 5.7×28 case is bottlenecked and tapered, and it stacks in twenty round magazines that are noticeably taller than most pistol magazines. Rounds that nose-dive or ride up unevenly are the usual failure, and hand cycling A-Zoom 5.7×28 Snap Caps through a magazine shows that immediately.
Ammunition cost is the other factor. 5.7×28 is not a cheap cartridge, and running function checks on inert rounds rather than live ones adds up quickly across a Five-seveN, a Ruger 57 and a PS90 in the same safe.
PS90 owners get a third use. The horizontal top mounted magazine on that carbine rotates rounds ninety degrees on their way to the chamber, and confirming that the rotation and lift work smoothly with inert rounds is far easier than diagnosing it live.
- Caliber: 5.7x28mm
- Quantity: 5 per pack
- Construction: CNC machined solid aluminum, hard anodized
- Primer: proprietary polymer dead cap, rated 3,000+ dry fires
- Design: one piece, exact dimensions of a loaded cartridge
- Uses: dry fire practice, magazine and feed testing, extractor checks, action release
- Made in the USA
- Manufacturer item: PA15130 / UPC 666692151309
Field Notes
Delayed blowback pistols like the Five-seveN and the Ruger 57 depend heavily on the magazine presenting rounds cleanly, and a tired magazine spring shows up as a feeding failure long before it shows up anywhere else. A-Zoom 5.7×28 Snap Caps are the cheapest way to find it.
They are also useful for practising loading and unloading. High capacity magazines take some effort to load by hand, and inert rounds let you build the technique without burning ammunition.
The polymer cushion is a consumable. When the face is deeply cratered and stops rebounding, retire that round rather than continuing to strike a dead cushion.
Shooting other auto calibers? The line also covers 9mm Luger and 45 ACP. Construction details are published by A-Zoom.
For Five-seveN, Ruger 57 and PS90 owners, A-Zoom 5.7×28 Snap Caps make magazine and function testing straightforward. MAG5 Firearms stocks them as manufacturer item PA15130 in the five pack.
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