Daniel Defense
Bulk case of twelve Daniel Defense 32-round AR-15 magazines, the way to stock a range bag in one buy

+11 more
This is the same Daniel Defense 32-round magazine sold twelve at a time. The body is carbon-fiber-reinforced polymer with a surface grip texture, an anti-tilt follower, an improved feed lip geometry, and an impact-absorbing baseplate, and it holds 32 rounds in the same external envelope as an industry-standard 30-round magazine.
The math is the reason to buy the case. At $284 the 12-pack works out to about $23.67 per magazine against $27 for a single on Daniel Defense's own site. Anyone running a class, stocking a range bag, or standardizing on one magazine across several rifles is buying magazines twelve at a time anyway.
Daniel Defense chambers the magazine for 5.56mm NATO, .223 Remington, and 300 Blackout, and the magazine disassembles for cleaning without tools. Fourteen states and the District of Columbia are excluded from shipping on capacity grounds, so check the restriction list before ordering: California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New York, New Jersey, Rhode Island, Vermont, Washington, and Washington D.C.

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Add the Daniel Defense 32-Round Magazine 12-Pack to your build and see how it enhances your platform.