• Post category:Gun Magazines
  • Post last modified:August 1, 2022
  • Reading time:24 mins read

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Best 300 Blackout Magazine

Top 16 Best Magazine For Diamondback 300 Blackout

Earlier many shooters had to use a magazine designed for another cartridge, using .300 Blackout in the AR-15 rifle, limiting its compatibility and performance. As a rule, 5.56x45mm becomes an alternative because of both cartridge parts’ compatibility.

Why do we need 300 Blackout Magazines?

It is better to choose a magazine specially chambered in .300 Blackout, because of increasing overall reliability, safer way to feed this round without dangerous cross-loading issues.

Best Picks

MAGPUL GEN M3 WINDOW MAGAZINE

MAGPUL GEN M3 WINDOW MAGAZINE

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The 30-Round magazine features impact and crush-resistant molded hard Polymer construction with clear polymer side windows to see the load status. It comes with a pop-off dust cover to minimize debris intrusion and prevent storage damage; a four-way anti-tilt follower to ensure smooth feeding even with dust or sand.

LANCER SYSTEMS 300BLK SMOKE MAGAZINE

LANCER SYSTEMS  300BLK  SMOKE MAGAZINE

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The 30-Round polymer magazine is equipped with a specially built non-tilting follower, providing flawless feeding, translucent smoke finish (easy to count rounds), and aggressive texturing for better grip.

#1 Lancer L5 Advanced Warfighter Magazine

Lancer L5 Advanced Warfighter Magazine

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Specification

Magazine Capacity: 10 Round; 5 Round
Caliber: .300 AAC Blackout; .223 Remington, 5.56x45mm NATO

These mags are manufactured for use with weighty subsonic .300 Blackout ammo (200+ grain) due to the updated inner geometry that facilitates longer heavier cartridges to stack duly. The mags are equipped with a floor plate, which is a contrasting flat dark earth color for easy visualization. Lancer designed three magazine models: two 10-rd in Translucent Smoke and Opaque Black for .300 Blackout, and one 5-rd in Translucent Smoke for .223/5.56 calibers. There are particular molded .300 Blackout markings on the magazine body exterior.

Pros
  • Increased feeding dependability compared with a conventional 5.56/.223 mags

  • Perfect fit and feeding

  • Excellent for heavy grain 300 BLK ammunition

  • No need for modifications as it’s done at the factory

  • Great hunting mag looks nice on the rifle

  • Holds the ammo tightly so it doesn’t rattle around

  • Runs 5.56, 300 blk, and 350 legend without malfunction

  • Very lightweight

  • A quality combination of polymer and metal construction

Cons
  • Wouldn’t lock into place in the S&W M&P 15 sport 2

#2 CompMag 10-Round Compliant Locked Magazine

CompMag 10-Round Compliant Locked Magazine

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Specification

Color: Black
Finish: Black Oxide
Fabric/Material: 17-7 Stainless Steel
Magazine Capacity: 10 Round
Caliber: 5.56x45mm NATO
Gun Model: AR-15
Additional Features: Easier to load than standards magazine, the follower can be retracted to load

The AR-15 CompMag with a round counter features a new expandable insert built right into its side for better locking. Unique fixed magazine design ensures an ammo feeding of a contained or constantly attached device to a gun: magazine can be removed only after disassembly of the firearm action.

The mags fit apart from standard AR-15 type lowers (M4, M16, AR15), also firearms, which accept STANAG (AR-15) magazines and have removable upper receivers (the Bushmaster ACR, SCAR16, CZ Bren, Daewoo DR200, SIG MCX, and SIG 556. But they are not paired with lowers, which are outfitted with a custom or extended magazine well (such as Sharps Bros, Seekins SP225, Spike’s Jack, and HKMR), or with BullPup guns such as the Tavor.

Pros
  • Lifetime Warranty

  • Easier to load than standards mags (no heavy spring to push each round against)

  • Operates with .223, 5.56, .300ACC Blackout, and .277 Wolverine Ammo

  • Fixed installation methods allow the customers to modify their mags up to them, while keeping the favorite AR-15 features, such as pistol and forward grip, flash hider, and retractable stock

  • No pins to pull out to reload

  • One screw mounting: no holes to drill

  • Fully loads on a closed or open bolt

  • Crush resistant FRP composite (G.F. Nylon 6) construction, which sidewalls are thicker than most polymer mags

  • No fumbling with extra parts or loaders

  • The follower can be retracted to load

  • CA compliant version

Cons
  • Pricey

  • False advertising: the neat loading design doesn’t feasibly help cleaning a jam

  • A locked mag AR-15 is allowed in California: but this magazine isn’t appropriate as even after max turning the screw, it can be pulled off with the little pin

#3 Hexmag HX Ar-15  Magazine

Hexmag HX Ar-15  Magazine

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Specification

New item: Yes
Ar-15 accessory: Y
Capacity: 10 rounds
Finish: Flat dark earth
Material: Polymer
Other features: 10 Round capacity in a 30 Round body

The Hexmag Polymer Magazine, Series 2, is a 30 round magazine body, which is limited to 10 rounds; it is not a short one. There are 4 available models in different colors: OD Green, Grey, Flat Dark Earth, or Black: they can be assembled with HexID colors according to the order. Such custom mags are not for resale, they are only available for consumers. The mags are made from PolyHex2 Advanced with the HEXTURE design pattern to ensure a solid grip for easy and fast reloading.

Pros
  • Inexpensive price but decent quality

  • Appropriate for states with strict magazine restrictions

  • Easy to grip

  • Composite construction is rigid but lightweight

  • Looks great

  • Comfortable to load

  • Quality plastic: reloads without worrying about breaking any mags, the plastic isn’t cheap

  • Easily convertible to a 30-round magazine

  • No jams in the spring

  • Solid construction

  • The texture is great

  • The longer magazine makes it much easier to handle compared to the small 10 rounders that barely stick out of the mag well

  • CA Compliance

Cons
  • Hex pattern can make it difficult to insert into the mag well

  • Not obvious advertising: confusing capacity

  • Can be inserted too far into the mag well or get stuck there

  • A bit loose in the mag well

  • Not the best with stripper clips

#4 Duramag Speed  Aluminum Rifle Magazine

Duramag Speed  Aluminum Rifle Magazine

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Specification

Fabric/Material: 6061-T6 Aluminum
Caliber: 5.56x45mm NATO, .300 AAC Blackout, .223 Remington
Gun Make: AR Platform
Gun Model: AR-15
Gun Type: Rifle
Additional Features: Lightweight and durable
Included Accessories: 1 Mag Sealed Plastic Bag, 50/case

The Speed magazine is an improved version of the battle-proven USGI one, which is good for OEM, Law Enforcement, and Military units. These CPD mags are equipped with the new snap anti-tilt follower. The body is constructed from heat-treated aluminum (6061-T6), delivering sturdiness with only a slight increase in weight. The due rounds’ stacking improves thanks to a combination of the .020-gauge material in stainless steel with the increased inner dimensional room, significantly decreasing jams failure.

Pros
  • Lightweight, but durable

  • The Stainless-Steel Magazine outperforms the mil-spec aluminum one in every test

  • A wide range of colors is part of both anodizing process and metal

  • An orange follower

  • Safe for extended storage while loaded without flex or swell like polymer

  • The technology of fully automated robotic welding stations is used, ensuring high-quality welding

Cons
  • Impossible to get a full 5 rounds: it seems they just haphazardly crimp the mags stopping the follower from taking full capacity

  • The body is far from Aluminum it seems to be some kind of powdered metal or just cheap pot-metal: after dropping the mag on the ground, a large chunk broke off its bottom sending the spring flying out

  • The loading and unloading area is sharp and tends to snag

  • Low quality and poorly assembled: the teeth that hold the bottom plate can be easily broken

  • The paper-thin follower appears to be some type of ABS plastic

  • Looking like you have 20 rounds (but you don’t): it’s a magazine for 20 rounds that is crimped on the outside so the follower can only go down a 10-round depth

#5 MDT Polymer Detachable Box Magazine

MDT Polymer Detachable Box Magazine

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Specification

Color: Black
Fabric/Material: Polymer
Magazine Capacity: 10 Round
Caliber: .223 Remington
Quantity: 1

This high-quality polymer magazine with tempered-steel spring operates well with the ACC, MDT TAC21, ESS, XRS, LSS-XL, and LSS Chassis systems, and many other M24 type chassis and bottom metals. But the mags do not fit the following inlets: Browning X-bolt, Ruger American in 204/ 223/ 556/ 300 AAC, Winchester XPC (may need fitting in Winchester Model 70). According to the customers’ feedback, some systems may need adjustment: KRG X-Ray, XLR Chassis; GRS rifle stocks, CDI Precision bottom metals, Pacific tool, and Gauge bottom metals are configured for AICS mags; 223 Magazine requires feed lip fitting and modifications to the inner ribs; 300 Blackout AR-15 mags may not feed on an AICS magazines in the bolt action rifle.

Pros
  • A detachable box mag makes loading of bolt-action rifle easier and quicker than an inner magazine, being ideally suitable for range training and competitive target shooting

  • Easy to load, and release

  • Put a Savage Axis 300 blk in the LSS chassis: the 223 mag runs with 300 blk in a savage axis and is very smooth

  • Pretty sturdy for the range

  • Works for the Magpul hunter stock for .204 Ruger after removing a bit of material from the top front and rear

  • Functions flawlessly with factory ammo

  • Longer OAL Friendly: good for heavy bullets like the Berger VLDs and Hornady ELD-Ms for bolt action rifles, can be loaded as long as 2.4 in with no feeding issues

  • Dependable as spare mags for hunting or competition

  • Operates well on the newer MDT LSS chassis and a Brownells branded MDT chassis for a Tikka T3, no fitment issues

  • Fits the Remington 700 .223 ACIS DBM like a glove, the price, and mags quality are great

Cons
  • Remington M700 SA .223 installed in AICS Stage II setup: rough fit, doesn’t lock up in mag well and load sequence is rough and troublesome

  • Feed lips cannot be adjusted, not convenient for any plastic magazine

#6 Duramag  Stainless Steel Rifle Magazine

Duramag  Stainless Steel Rifle Magazine

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Specification

Color: Black/Orange, Matte Black/Orange
Finish: Matte
Fabric/Material: 410 Stainless Steel
Magazine Capacity: 5 Round
Caliber: 5.56x45mm NATO, .300 AAC Blackout, .223 Remington
Gun Make: AR Platform
Gun Model: AR-15
Gun Type: Rifle
Additional Features: EverFlex anti-fatigue spring technology for long life and ultimate reliability
Included Accessories: 1 Mag Sealed Plastic Bag, 50/case

Duramag constructed the mags incorporating Specially Engineered Geometry and Advanced Proprietary Coatings, which due to Black-T at the molecular level minimizes the coefficient of friction, extending service life through an unparalleled lubricity. All CPD mags have the new snap on the anti-tilt follower.

Pros
  • EverFlex anti-fatigue spring technology for long life and maximal dependability

  • SS Advanced Proprietary Coatings ensure a smooth, flawless operation

  • Not Jam even using the dirtiest ammo

  • The technology of fully automated robotic welding stations excludes defects

Cons
  • The 5.56 stainless steel Magazine is dented easily

#7 CZ AAC Blackout 5 Rd Black Finish

CZ AAC Blackout 5 Rd Black Finish

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Specification

Mfg Item Num: 13014
Supplier SKU: 24872
Category: MAGAZINES AND ACCESSORIES
Caliber: 300 AAC Blackout/Whisper (7.62x35mm)
Capacity: 5 rd
Finish: Black
Type: Detachable
Model Fit: CZ 527
Brand Fit: CZ

CZ USA designed these detachable mags for CZ 527 guns, appropriate for 2 calibers: .300 AAC Blackout, .300 Whisper.

Pros
  • Suitable for prone shooting

Cons
  • California’s Proposition 65

  • Not yet rated

#8 MDT Polymer Magazine

MDT Polymer Magazine

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Specification

Color: Black
Fabric/Material: Polymer
Magazine Capacity: 8 Round
Caliber: .224 Valkyrie
Gun Type: Rifle

MDT Detachable box mags are engineered to be compatible with the MDT TAC21, LSS Chassis systems, and many other M24 type chassis and bottom metals, as well as Howa 1500 mini-action.

Pros
  • Durable construction made from high-quality Polymer

  • Comes with a tempered steel spring

  • Available in .223 and .308

Cons
  • Not yet rated

#9 H-S Precision Remington 700 BDL Detachable Magazine

H-S Precision Remington 700 BDL Detachable Magazine

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Specification

Color: Black
Magazine Capacity: 7 – 10 Round
Gun Make: Remington
Gun Model: Remington Model 700 BDL
Gun Type: Rifle

The stainless-steel magazine with Teflon matte black finish comes with the polymer boot, which allows easily installing and removing the magazine box. Thanks to a center-feed design every round stack properly, because the cartridge directly lines with the chamber every time. After adjusting the feed lips, one of the magazine boxes with a new Gen II design can be used for almost any caliber. They will not be compatible with floor plate conversion sets before 2012.

Pros
  • Sturdy polymer boot that encircles the bottom of each mag

  • Rounds stack duly due to the stainless-steel follower with an extra-large spring

Cons
  • Not yet rated

#10 MagPump  AR-15 Magazine

MagPump  AR-15 Magazine

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Specification

Caliber: 5.56x45mm NATO, .300 AAC Blackout, .223 Remington
Gun Model: AR-15
Number of Rounds: 90
Attachment/Mount Type: Weaver, Picatinny
Additional Features: Constructed Of Lightweight and Durable Polymer

Magazine Loader without MagDump comes with Weaver or Picatinny rail attachment. The hopper-fed, loose ammunition loader is manufactured of lightweight and rigid Polymer. This loader is irreplaceable for preparing for a full day at the range.

Pros
  • Fits all Mil-Spec AR-15 mags

  • 90-Round capacity hopper

  • Needs much less physical strength and effort to fully load mags

  • No round damage while loading or stop loading when the magazine is full due to the built-in safeties

  • Loading is super-easy, without hand fatigue, just insert the mags securely

  • Two options of mounting: Picatinny or Weaver rail

  • Places ammo in either direction

  • Operates exactly as advertised

  • Great tool for loading high capacity mags

  • Relatively compact unit

  • Loaded mags save time at home and the range

  • No need to use stripper clips, so you can save money on each round

  • Magazine loading time is decreased twice

Cons
  • Need to keep count toward the end of the hopper

  • Will jam if you go too fast

  • The 7.62×39 version has to be used/mounted near the table edge

#11 MAGPUL GEN M3 WINDOW MAGAZINE

MAGPUL GEN M3 WINDOW MAGAZINE

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Specification

Impact/crush-resistant molded hard polymer, Black. Compatible with AR-15/M4/M16, HK® 416, MR556A1, M27 IAR, British SA-80, FN® SCAR™ MK 16/16S, and other similar lowers. 5.56mm/.223 ammunition only.

These mags with extra reinforcement in the mag catch and feed lip areas fit AR-15, M4, M16, HK 416, MR556A1, M27 IAR, British SA-80, FN SCAR MK 16/16S, and other similar lower. Advanced clear polymers in windows are more resistant to chemicals and impact than the original MagLevel PMAG. MAGPUL offers 1, 10 or 100 mags (only for 5.56 mm NATO) in the pack.

Pros
  • USA made;

  • Impact and crush-resistant molded hard Polymer

  • Clear polymer side windows allow the shooter to see the load status

  • The removable floor plate is both stronger and slimmer for easier side-by-side carry in tight mag pouches

  • Included pop-off dust cover minimizes debris intrusion, preventing storage damage

  • A new-design four-way anti-tilt follower delivers smooth feeding even with dust or sand

Cons
  • None yet

#12 D&H INDUSTRIES BLACKOUT MAGAZINES

D&H INDUSTRIES BLACKOUT MAGAZINES

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Specification

AR-15 magazine chambered in 300 Blackout. The magazine is constructed of an aluminum body with a red magazine follower. Available in 10, 20, and 30 rounds.

The AR-15 Aluminum magazine comes with a red follower.

Pros
  • Lightweight

Cons
  • PSA build will not feed rounds into the chamber

  • Poor quality

  • Doesn’t feed duly: the follower is on the wrong side

  • Doesn’t lock the bolt back on the last round

#13 CVA CASCADE 300 BLACKOUT MAGAZINE

CVA CASCADE 300 BLACKOUT MAGAZINE

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Specification

Capacity: 4-Round
Cartridge: 204 Ruger, 300 AAC Blackout
Finish: Black
Material: Polymer
Quantity: 1

These detachable mags are constructed for the CVA Cascade bolt action rifles. They are good for replacement and backup.

Pros
  • Tough polymer material

Cons
  • Not yet rated

#14 MAGPUL 300 BLK  MAGAZINE

MAGPUL 300 BLK  MAGAZINE

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Specification

Cartridge: 300 AAC Blackout
Capacity: 30-Round
Quantity: 1
Finish: Black
Material: Polymer

These mags feature distinct rib designs to allow the shooter a distinct visual and tactile difference from any other PMAG to minimize dangerous cross-loading issues. The magazines are outfitted with an easily removable slim floor plate, aggressive front and rear texture, a paint pen dot matrix for marking and identification, and a dust/impact cover.

Pros
  • Designed especially for .300 Blackout, meeting this caliber compatibility and performance requirements

  • The safer way to feed .300 BLK in the rifle

  • Next-generation impact and crush resistant polymer

  • Lightweight

  • Loads great

Cons
  • Compared to the Gen2 5.56’s the polymer is thinner and cheaper feeling: raw mold, the feed lips are sharp-edged, not rounded

  • Rattles excessively internally

#15 LANCER SYSTEMS  300BLK  SMOKE MAGAZINE

LANCER SYSTEMS  300BLK  SMOKE MAGAZINE

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Specification

Translucent smoke finish
30-round capacity
Features feed lips made from hardened steel
Provides aggressive texturing for enhanced grip

The polymer magazine with the translucent smoke finish is equipped with a specially built non-tilting follower, which geometry is purpose-built for the cartridge, and hardened steel feed lips.

Pros
  • Trouble-free feeding

  • Aggressive texturing for better grip

  • Passed all military-grade testing for high-performance use

  • Corrosion and chemical resistance

  • Looks nice

  • Easy to count rounds due to the transparent finish

Cons
  • The plastic feels thin and may crack easily if dropped

#16 MAGPUL – 20 AR 300B GEN M3 PMAG

MAGPUL - 20 AR 300B GEN M3 PMAG

View on Brownells

Specification

Cartridge: 300 AAC Blackout
Capacity: 20-Round
Quantity: 1
Finish: Black
Material: Polymer

The more compact magazine operates well with small rifle-caliber platforms, textured so the shooter can feel the difference, easier to use at the range. The mags are made of rugged polymer, coming with an easy-to-remove baseplate for cleaning, a dot matrix for organization, and a dust cover, which protects feed lips from impacts as well.

Pros
  • Manufactured in the USA

  • A safer way to shoot due to a distinct look and feel: no risk of chambering a 300 Blackout round in 5.56 NATO

Cons
  • None yet

Conclusion

Aluminum construction magazines are light but sturdy, they get dents when dropped but are usually fine. 5-round magazines, compared with full-length ones, are convenient for prone shooting. If you live in the states with strict magazine limits, Lancer or MDT magazines with 5 and 10 round capacity.

Tags: #best 300 blackout magazine / #best magazine for 300 blackout / #best 300 blackout 10 magazine / #best magazine for diamondback 300 blackout / #best magazine 300 blackout

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