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CMMG’s 5.7 AR Conversion Magazines hold 10 or 40 rounds of 5.7x28mm and fits in any standard AR-15 lower receivers. To use, simply attach a CMMG 5.7x28mm Radial Delayed Blowback complete upper receiver to an existing AR-15 lower. Then, insert CMMG’s 5.7 AR Conversion Magazine to safely feed 5.7x28mm ammunition. CMMG recommends using a standard carbine buffer and action spring to reliably cycle the action in this configuration. The 5.7 AR Conversion Magazine also retains last round bolt hold-open functionality, allowing for faster reloads.

  • 5.7x28mm
  • 10 or 40 rounds, also available in 3-Packs
  • 8 oz unloaded


Big Book Catalog, Issue:73, Page:074

CMMG - AR-15 CONVERSION MAGAZINES 5.7X28MM

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4 Item(s)
Online Only
In Stock

Cartridge: 5.7 x 28 mm

Capacity: 40-Round

Quantity: 1

Finish: Black

Material: Polymer

Online Only
In Stock

Cartridge: 5.7 x 28 mm

Capacity: 40-Round

Quantity: 3

Finish: Black

Material: Polymer

Online Only
In Stock

Cartridge: 5.7 x 28 mm

Capacity: 10-Round

Quantity: 1

Finish: Black

Material: Polymer

Online Only
In Stock

Cartridge: 5.7 x 28 mm

Capacity: 10-Round

Quantity: 3

Finish: Black

Material: Polymer