D&H Magazine 300 Blackout Fits AR Rifles 30rd

Product Description

The D&H Magazine 300 Blackout Fits AR Rifles 30rd is a 30-round magazine built by D&H specifically for 300 Blackout chambered AR rifles. This magazine uses feed geometry tuned to the wider, heavier profile of 300 Blackout cartridges compared to 5.56 NATO.

300 Blackout magazines require a wider internal profile and adjusted follower design to accommodate the cartridge’s shoulder and diameter. Using a standard 5.56 magazine can lead to feeding issues under sustained fire or during rapid follow-up shots.

Key Facts

• Brand: D&H
• Caliber: .300 Blackout
• Capacity: 30 rounds
• Platform: AR rifles chambered in 300 Blackout

Why 300 Blackout Needs a Dedicated Magazine

300 Blackout was designed to run in the AR-15 platform, but the cartridge is fatter and shorter than 5.56 NATO. While some 5.56 magazines will feed 300 Blackout, they often bind under spring tension or tilt cartridges during the feed cycle.

A dedicated 300 Blackout magazine ensures consistent angle of presentation at the feed lips and proper stack geometry from round one to round thirty. This becomes most noticeable when shooting suppressed or switching between supersonic and subsonic loads in the same range session.

D&H Magazine Construction and Fit

D&H manufactures magazines for military and commercial use. The feed lips, body, and follower are engineered to mil-spec dimensions where they interface with the lower receiver, so drop-free function and bolt hold-open work as expected.

The magazine body fits standard AR-15 lower receivers and works with mil-spec magazine releases. If you’re building or buying a 300 Blackout upper to run on an existing AR lower, this magazine will seat and lock without modification.

Pairing with Supersonic and Subsonic Loads

300 Blackout’s versatility comes from the ability to run heavy subsonic projectiles and lighter supersonic rounds through the same barrel. Both load types require smooth, consistent feeding to avoid short-stroking or failure to chamber.

The D&H 300 Blackout magazine’s follower and spring maintain upward pressure across the full range of bullet weights and overall cartridge lengths common in factory and handloaded 300 Blackout ammunition. For more magazines and caliber-specific options, browse our mags and ammo selection.

Ordering from Western Sport

Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: Will this D&H 300 Blackout magazine work in a 5.56 NATO AR-15?

A: No, this magazine is designed specifically for 300 Blackout and should not be used with 5.56 NATO or .223 Remington. The internal dimensions and follower geometry are optimized for the wider 300 Blackout cartridge. Using the wrong magazine can cause feeding malfunctions and unsafe chambering.

Q: Does the D&H 300 Blackout 30-round magazine fit standard AR-15 lowers?

A: Yes, this magazine fits any mil-spec AR-15 lower receiver. The exterior dimensions and locking lugs are standard, so it will seat, lock, and release like a standard AR magazine. Only the internal geometry is specific to 300 Blackout.

Q: Can I use this magazine for both supersonic and subsonic 300 Blackout loads?

A: Yes, the D&H 300 Blackout magazine is designed to feed both supersonic and subsonic ammunition. The follower and spring tension accommodate the range of bullet weights and overall lengths typical in 300 Blackout factory loads and handloads.

Q: How does a 300 Blackout magazine differ from a 5.56 magazine?

A: The 300 Blackout magazine has a wider internal body and a follower designed for the cartridge’s shoulder and diameter. While some shooters report success with 5.56 magazines, dedicated 300 Blackout magazines reduce tilt and binding, especially under full spring pressure or rapid fire.

Q: What should I verify before ordering this magazine?

A: Confirm your rifle is chambered in 300 Blackout and uses a standard AR-15 lower receiver.

Additional information