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
Winchester Repeating Arms USA300BLK 20 rounds 020892224568 $0.85/rd $16.99 In Stock 3d ago 34s ago Griswald Defense
AMMO INCORPORATED STELTH 300 BLACKOUT 220GR TMC 20/200 818778022175 $0.85/rd $16.99 In Stock 17d ago 20m ago Hot Ammo
AMMO INCORPORATED STELTH 300 BLACKOUT 220GR TMC 20/200 818778022175 $0.85/rd $16.99 In Stock 6d ago 30m ago Charter Tactical
Frontier Cartridge HRN 300BLK 125GR FMJ FRONTIER 20 rounds 090255713978 $0.85/rd $16.99 In Stock 37d ago 20m ago Hot Ammo
Sellier & Bellot Rifle FMJ 300BLKB 20 rounds 754908512454 $0.85/rd $16.99 In Stock 70d ago 28m ago Sahuarita Guns
Frontier Cartridge HRN 300BLK 125GR FMJ FRONTIER 20 rounds 090255713978 $0.85/rd $16.99 In Stock 6d ago 30m ago Charter Tactical
Precision One - 300 Blackout - 130 Grain - HP - 20 $0.85/rd $16.99 In Stock 28d ago 2h ago True Shot Ammo
SB SELLIER & BELLOT 300BLK 200GR FMJ SUBSONIC BRASS AMMUNITION 20rd BOX 754908517466 $0.85/rd $16.99 In Stock 14d ago 10m ago BattleHawk Armory
Barnes: 300BLK, 120gr, JHP FB, 20/Box 716876120307 $0.85/rd $16.99 In Stock 73d ago 16m ago Mile High Shooting
Winchester Repeating Arms USA300BLK 20 rounds 020892224568 $0.85/rd $16.99 In Stock 8h ago 2h ago Get Loaded PA
Sellier & Bellot 300 AAC Blackout Ammunition SB300BLKA 124 Grain Full Metal Jacket 20 rounds 754908512447 $0.85/rd $16.99 In Stock 172d ago 39m ago Outdoor Limited
Sig Sauer SIG E300B120 798681619634 $0.85/rd $16.99 In Stock 7d ago 49m ago BFG Outfitters
WINCHESTER USA .300 aac blackout open tip range 20 rounds 020892224568 $0.85/rd $16.99 In Stock 9h ago 33m ago Guns.com
Sig Sauer Elite FMJ Supersonic Ammunition .300 AAC 125 Grain 20 Round Box 798681619634 $0.85/rd $16.99 In Stock 16d ago 59m ago Tombstone Tactical
Winchester Repeating Arms USA300BLKX 20 rounds 020892224582 $0.85/rd $16.99 In Stock 17d ago 20m ago Hot Ammo
Winchester Repeating Arms USA300BLK 20 rounds 020892224568 $0.85/rd $16.99 In Stock 3d ago 1h ago Elite FIrearms Online
SELLIER & BELLOT RIFLE .300 aac blackout 147 grain full metal jacket (fmj) 20 rounds 754908512454 $0.85/rd $16.99 In Stock 51d ago 33m ago Guns.com
SELLIER & BELLOT RIFLE .300 aac blackout 124 grain full metal jacket (fmj) 20 rounds 754908512447 $0.85/rd $16.99 In Stock 51d ago 33m ago Guns.com
Winchester Repeating Arms USA300BLKX 20 rounds 020892224582 $0.85/rd $16.99 In Stock 6d ago 30m ago Charter Tactical
Winchester 300 Aac Blackout - Winchester Usa Target Full Metal Jacket 147 Grain - 20 Round Box 020892231030 $0.85/rd $16.99 In Stock 6d ago 2h ago FlipAmmo
Armscor 300 AAC Blackout Ammunition ARM50452 Subsonic 220 Grain Boat Tail Hollow Point 20 Rounds 4806015504528 $0.85/rd $16.99 In Stock 30d ago 39m ago Outdoor Limited
Frontier Cartridge FR400 Rifle 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 090255713978 $0.85/rd $17.00 In Stock 26d ago 12m ago Locked Loaded
Winchester 300 AAC Blackout - Winchester Usa Target Full Metal Jacket 147 Grain - 200 Round Box $0.85/rd $169.99 In Stock 14d ago 2h ago FlipAmmo
Frontier | 300 BLK | 125gr | FMJ - 200rd Case 090255713978 $0.85/rd $169.99 In Stock 23d ago 27m ago Recoil Gunworks
Winchester USA 300 AAC Blackout Ammo - 200 Rounds of 125 Grain... $0.85/rd $169.99 In Stock 7d ago 3m ago Ammo.com
Winchester Ammo USA300BLK USA 300 Blackout 125 gr 2185 fps Open Tip Range - 200 Rounds - Free Shipping! 020892224568 $0.85/rd $169.99 In Stock 14h ago 2h ago Bereli
300 AAC Blackout - 125 Grain Open Tip - Winchester USA - 200 Rounds $0.85/rd $170.00 158 147d ago 59m ago Lucky Gunner
Sellier & Bellot 300 AAC Blackout Ammunition SB300BLKA 124 Grain Full Metal Jacket CASE 1000 rounds $0.85/rd $849.50 In Stock 172d ago 39m ago Outdoor Limited
Winchester Ammo USA300BLKX USA 300 Blackout 200 gr Open Tip Range 20 Bx/ 10 Cs 020892224582 $0.85/rd $17.02 In Stock 5d ago 6m ago Dack Outdoors
Winchester Ammunition USA, 300 Blackout, 200 Grain, Open Tip, Subsonic, 20 Round Box USA300BLKX 020892224582 $0.85/rd $17.05 In Stock 24d ago 56m ago Foundry Outdoors
Frontier Cartridge FR400 Rifle 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 090255713978 $0.85/rd $17.05 In Stock 15d ago 1h ago Defense Depot
Sig Sauer E300B120 Elite Performance 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 25 Cs 798681619634 $0.85/rd $17.06 In Stock 8d ago 6m ago Dack Outdoors
Sellier & Bellot .300 Blackout, 124gr, FMJ, 20rd Box 754908512447 $0.85/rd $17.08 In Stock 73d ago 25m ago Impact Guns
AMMO INC AMO SIGNATURE SERIES 300 BLACKOUT 150GR FMJ 20RD ( 25 PER CASE ) 818778021826 $0.85/rd $17.08 In Stock 2d ago 15m ago Acute Firearms
Winchester Ammo USA300BLK USA 300 Blackout 125 gr Open Tip Range 20 Bx/ 10 Cs 020892224568 $0.85/rd $17.08 In Stock 39m ago 39m ago SHTF Tactical
SELLIER & BELLOT - 300 AAC Blackout 124gr FMJ 20/Box 754908512447 $0.86/rd $17.09 In Stock 17d ago 50m ago Brownells
Sig Ammo .300 Blackout 125Gr. Elite Ball Fmj 20-Pack E300B1-20 798681619634 $0.86/rd $17.09 In Stock 8d ago 56m ago Foundry Outdoors
Factory 2nds: Stryker 300 AAC Blackout 150 gr Polymer Tip - 400 ct. $0.86/rd $342.00 In Stock 32d ago 22m ago The American Marksman
S&B 300 Blackout, 124 Grain, Ful 20 rounds 754908512447 $0.86/rd $17.11 In Stock 1d ago 24m ago Cape Gun Works
Remington UMC Brass .300 AAC Blackout 150-Grain 50-Rounds FMJ 047700486505 $0.86/rd $42.79 In Stock 22h ago 23m ago GrabAGun.com
AMMO INC AMO STELTH 300 BLACKOUT 220 GR TMC 20RD BX 818778022175 $0.86/rd $17.13 In Stock 16d ago 2h ago Huligan Arms
Win Usa 300blk 200gr Ot 20/200 020892224582 $0.86/rd $17.15 In Stock 14d ago 1h ago Tactical Surplus USA
PPU PP300BF Standard Rifle 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 50 Cs 8605003812425 $0.86/rd $17.18 In Stock 16d ago 59m ago Tombstone Tactical
Frontier Cartridge FR400 Rifle 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 090255713978 $0.86/rd $17.19 In Stock 16d ago 6m ago Dack Outdoors
Fiocchi Shooting Dynamics Rifle 300BLKC 50 rounds 762344711010 $0.86/rd $42.99 In Stock 86d ago 34s ago Griswald Defense
Fiocchi Range Dynamics 300 Blackout 150 gr Full Metal Jacket Boat-Tail - 50 Rounds -Free Shipping! 762344711010 $0.86/rd $42.99 In Stock 15d ago 2h ago Bereli
REM 26855 L300AAC2V UMC 300BO VP 150 FMJ 50/8 047700486505 $0.86/rd $43.01 In Stock 10d ago 2h ago Skogen’s Gun Supply
Armscor Precision 300 Blackout 147 gr. FMJ 100 rnd/VALUE PACK 4806015504467 $0.86/rd $85.99 In Stock 29d ago 25m ago Ammo Supply Warehouse
Fiocchi Shooting Dynamics 300 Blackout, 150gr, Full Metal Jacket, 50rd Box 762344711010 $0.86/rd $43.09 In Stock 7d ago 25m ago Impact Guns
REM 26855 L300AAC2V UMC 300BO VP 150 FMJ 50/8 047700486505 $0.87/rd $43.36 In Stock 10d ago 10m ago BattleHawk Armory

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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