The .300 Blackout rifle cartridge is also known as 300 AAC Blackout, 300 BLK, and 7.62x35mm. Its design comes from the idea to develop a cartridge more powerful than AR-15’s native 223/5.56, with ballistics similar to those of the 7.62x39mm. This new cartridge had to work reliably with both supersonic and subsonic ammo, in the barrel that is less than 16 inches long. When fired through a suppressor, .300 Blackout bullets give a silent, yet powerful rifle. This ammo can be used for hunting, target shooting, as well as for home defense. Learn more about 300 BLK

Product Per round Price Status/Qty Last change Last update Store
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.20/rd $10.41 In Stock 14d ago 40m ago Dack Outdoors
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.50/rd $10.99 In Stock 77d ago 20m ago GunZoneDeals
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.52/rd $11.04 In Stock 14d ago 26m ago Huligan Arms
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $6.14/rd $12.29 In Stock 17d ago 13m ago SHTF Tactical
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.62/rd $12.45 In Stock 2d ago 16m ago Locked Loaded
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.62/rd $12.49 In Stock 1d ago 2h ago Defense Depot
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.63/rd $12.59 In Stock 2d ago 40m ago Dack Outdoors
Ammo Inc. Signature, .300 AAC Blackout, FMJ, 150 Grain, 20 Rounds $0.64/rd $12.82 In Stock 3d ago 29m ago Sportsman's Guide
Ammo Inc. Signature .300 Blackout 150 Grain FMJ 20 Round Box $0.65/rd $12.95 In Stock 120d ago 28m ago Shark Coast Tactical
Armscor 300BO FMJ FAC300AAC1N 20 rounds 812285021089 $0.65/rd $12.99 In Stock 6d ago 23m ago BFG Outfitters
Ammo Inc 300 Blackout 150 Gr Full Metal Jacket Brass Ammunition 20rd BOX 818778021826 $0.65/rd $12.99 In Stock 12d ago 14m ago BattleHawk Armory
AMMO INCORPORATED 300B150FMJA20 818778021826 $0.65/rd $12.99 In Stock 13d ago 54m ago Hot Ammo
AMMO INCORPORATED 300B150FMJA20 818778021826 $0.65/rd $12.99 In Stock 5d ago 4m ago Charter Tactical
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.65/rd $12.99 In Stock 2d ago 20m ago GunZoneDeals
Wolf - 300 Blackout - 145 Grain - FMJ - Steel Case - 20 $0.65/rd $12.99 In Stock 9d ago 7m ago True Shot Ammo
Ammo Inc 300blk 150gr Fmj 20/500 818778021826 $0.66/rd $13.10 In Stock 13d ago 2h ago Tactical Surplus USA
Sellier & Bellot 300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 Bx/ 50 Cs 754908512447 $0.66/rd $13.29 In Stock 18h ago 16m ago Locked Loaded
Sellier & Bellot, .300 AAC Blackout, FMJ, 124 Grain, 20 Rounds $0.66/rd $13.29 In Stock 5d ago 29m ago Sportsman's Guide
Sellier & Bellot 300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 Bx/ 50 Cs 754908512447 $0.66/rd $13.30 In Stock 18h ago 40m ago Dack Outdoors
Sellier & Bellot 300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 Bx/ 50 Cs 754908512447 $0.67/rd $13.33 In Stock 18h ago 2h ago Defense Depot
Armscor Ammo .300Aac Blackout 147gr. FMJ 20Rd Box 812285021089 $0.67/rd $13.34 In Stock 31d ago 28m ago Foundry Outdoors
Armscor FAC300AAC1N Rifle 300 Blackout 147 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 812285021089 $0.67/rd $13.35 In Stock 12h ago 16m ago Locked Loaded
Ammo Inc. Signature .300 AAC BLACKOUT, 150gr, FMJ - 20 rounds 818778021826 $0.67/rd $13.41 In Stock 1d ago 10m ago Firearms Depot
Sellier Bellot 300BLKA Rifle 300 AAC Blackout 124 GR Full Metal Jacket 20 Bx/ 50 Cs 754908512447 $0.67/rd $13.42 In Stock 19h ago 28m ago Foundry Outdoors
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.67/rd $13.42 In Stock 2d ago 34m ago Skogen’s Gun Supply
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.67/rd $13.45 In Stock 12d ago 26m ago Huligan Arms
WOLF AMO 300 BLACKOUT 145GR FMJ STEEL CASE 20RD ( 25 BOXES PER CASE ) 645611308673 $0.68/rd $13.55 In Stock 14d ago 40m ago Dack Outdoors
Sellier & Bellot (S&B) 300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 rounds 754908512447 $0.68/rd $13.56 In Stock 15d ago 8m ago Sentry Ammo
Sellier & Bellot 300BLKB Rifle 300 Blackout 147 gr Full Metal Jacket (FMJ) 20 Bx/ 50 Cs 754908512454 $0.69/rd $13.79 In Stock 28d ago 16m ago Locked Loaded
Sellier Bellot SB300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 Per Box/ 50 Case 754908512447 $0.69/rd $13.79 In Stock 19h ago 46m ago Hinterland Outfitters
Sellier Bellot Rifle, 300 Blackout, 147 Grain, Full Metal Jacket, 20 Round Box SB300BLKB 754908512454 $0.69/rd $13.79 In Stock 66d ago 28m ago Foundry Outdoors
Sellier Bellot Rifle, 300 Blackout, 124 Grain, Full Metal Jacket, 20 Round Box SB300BLKA 754908512447 $0.69/rd $13.79 In Stock 66d ago 28m ago Foundry Outdoors
Ammo Inc. Signature Brass .300 Blackout 150 Grain 20-Rounds FMJ 818778021826 $0.70/rd $13.89 In Stock 13d ago 57m ago GrabAGun.com
Sellier & Bellot (S&B) 300BLKB Rifle 300 Blackout 147 gr Full Metal Jacket (FMJ) 20 rounds 754908512454 $0.70/rd $13.90 In Stock 15d ago 8m ago Sentry Ammo
Sellier & Bellot 300BLKA Rifle 300 Blackout 124 gr Full Metal Jacket 20 Bx/ 50 Cs 754908512447 $0.70/rd $13.92 In Stock 15h ago 20m ago Guns 2 Ammo
Sellier & Bellot 300BLKB Rifle 300 Blackout 147 gr Full Metal Jacket (FMJ) 20 Bx/ 50 Cs 754908512454 $0.70/rd $13.95 In Stock 14d ago 40m ago Dack Outdoors
Armscor FAC300AAC1N Rifle 300 Blackout 147 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 812285021089 $0.70/rd $13.96 In Stock 14d ago 26m ago Huligan Arms
Sellier And Bellot 300 Blackout 124 gr FMJ 20/Box $0.70/rd $13.99 In Stock 20h ago 20m ago Sportsmans Outdoors Superstore
WOLF - 300 AAC Blackout 145gr Full Metal Jacket Bimetal 20/Box 645611308673 $0.70/rd $13.99 In Stock 16d ago 1h ago Brownells
Wolf Ammo 300 Blackout 145 Grain FMJ Polyformance Steel Case 20/Box $0.70/rd $13.99 In Stock 20h ago 20m ago Sportsmans Outdoors Superstore
AMMO INCORPORATED 300B150FMJA20 818778021826 $0.70/rd $13.99 In Stock 13d ago 32m ago GunsInStock.com
Wolf Polyformance 300 Blackout Ammo 145 Grain FMJ Steel Case Box of 20 - steel case 645611308673 $0.70/rd $13.99 In Stock 97d ago 53m ago Target Sports USA
300 AAC Blackout 124gr FMJ Sellier & Bellot Ammo Box (20 rds) $0.70/rd $13.99 In Stock 14h ago 4m ago The Armory
300 AAC Blackout 147gr FMJ Sellier & Bellot Ammo Box (20 rds) $0.70/rd $13.99 In Stock 1d ago 4m ago The Armory
Armscor 300BO FMJ FAC300AAC1N 20 rounds 812285021089 $0.70/rd $13.99 In Stock 9h ago 4m ago Charter Tactical
Sellier & Bellot Rifle FMJ 300BLKA 20 rounds 754908512447 $0.70/rd $13.99 In Stock 5d ago 4m ago Charter Tactical
Sellier & Bellot Rifle FMJ 300BLKA 20 rounds 754908512447 $0.70/rd $13.99 In Stock 16d ago 54m ago Hot Ammo
Sellier & Bellot Rifle FMJ 300BLKA 20 rounds 754908512447 $0.70/rd $13.99 In Stock 16h ago 23m ago BFG Outfitters
Armscor 300BO FMJ FAC300AAC1N 20 rounds 812285021089 $0.70/rd $13.99 In Stock 8d ago 35m ago United Patriot Supply
Sellier & Bellot Rifle FMJ 300BLKB 20 rounds 754908512454 $0.70/rd $13.99 In Stock 16d ago 54m ago Hot Ammo

300 Blackout Ammo

The .300 AAC Blackout is an intermediate cartridge designed to share ballistics similar to those of the 7.62x39 (AK-47 cartridge). It was developed for use in the M4 carbine and can be fired from a standard 5.56mm AR by only changing out the barrel.

It is also known as:

  • 300 BLK
  • 300 AAC Blackout
  • 7.62x35mm

Advanced Armament Corporation collaborated with Remington Defense to develop a .30 caliber cartridge that would surpass the performance of 5.56mm ammo. This long-contemplated idea of replacing AR-15s native 5.56mm came to life after United States Government launched an international military campaign aka global war on terror after 9/11, and our troops found themselves in unfamiliar geography and unknown situations. The demand for a cartridge that has was more powerful and more silent lead to AAC developing 300 Blackout ammo for special operations forces, using a 5.56mm case cut down to fit a 30- caliber bullet.

When was 300 BLK invented?

Although AR-pattern rifles and carbines had been previously chambered in different 30 calibers, feeding issues were present with each attempt. Many ammunition manufacturers had tried and failed, including Colt Firearms. The solution was found thanks to wildcatters. One of the wildcatted cartridges - .300 Whisper served as a concept to get to the final result, and the one to be submitted to SAAMI. Development began in 2009, with the cartridge approved by SAAMI in 2011.  

What’s the difference between 300 AAC and 5.56 / .223? 

Even though both rifle cartridges are suitable for target shooting, hunting, and home defense, there are a few differences between them.
300 blk bullet is stubbier, thicker, and heavier. 5.56mm NATO requires a longer barrel length, at least 12”. Once you add additional few inches that suppressor takes, it becomes impossible to get a powerful, yet short rifle.
On the other hand, 300 BLK works best in shorter-than-average barrels, which makes it super suitable for suppressed use. 300 blackout works reliably with both supersonic and subsonic ammo, but it shines when using subsonic and a suppressor, giving you a quiet and powerful bullet.
5.56 has a faster velocity and shoots flatter, while 300 penetrates through more material.  

300 BLK overcomes some of the shortcomings of larger calibers while providing the AR 15 with the possibility to shoot a larger round, with only switching the upper receiver.  

.300 AAC Blackout round military use

Netherlands 

The first formal adoption of 300 AAC happened in July 2015, when the Netherlands’ defense material organization bought 195 carbines chambered in this round. These integrally suppressed 300 BLK carbines were purchased for the Dutch Maritime Special Operations Force and modified to for use with ballistic visor helmets. 

United Kingdom 

Ministry of Defense ordered the supply of 300 Blackout ammo on a five-year contract, including the option to extend for an additional five years. The government noted the previous use of this round. 

United States

This round has not yet seen wide use in American Special forces, although SOCOM started using it in 2017, considering offers on how to modify 5.56 to accommodate 300 AAC rounds.   

Popular 300 Blackout Ammo Brands 

  • Remington
  • Fiocchi
  • Hornady
  • Magtech
  • Aguila
  • Sellier & Bellot
  • Barnes 

Which guns use 300 BLK Ammo?

A few popular models, including top-shelf rifles using with both supersonic and subsonic ammo, rifles widely used for home defense, hunting, or target shooting:
  • Daniel Defense DDM4
  • Wilson combat protector
  • IWI-US Tavor X95
  • Springfield Armory Saint
  • SIG MCX VIRTUS PISTOL
  • Ruger Ruger American Ranch Rifle
  • Ruger AR-556
Our selection is in no particular order regarding the best 300 blackout gun. Use this list as your starting point when searching for a weapon that suits you best.
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