.300 AAC Blackout (7.62×35 mm)
Intermediate
AR-15 cartridge optimized for suppressors and short barrels: same lower as 5.56, energy similar to 7.62×39.
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Overview
Developed by Advanced Armament Corporation (AAC) and SAAMI-standardized in 2011. Case made by shortening and reforming a .223 Remington, so it uses the same STANAG magazine and M4 bolt with only a barrel swap. Balances supersonic 125 gr and subsonic 220 gr loads for suppressed use.
Specifications
- Bullet diameter
- 7,82 mm (.308")
- Case length
- 35,0 mm
- Overall length
- 57,0 mm
- Bullet weight
- 8,1 g (125 gr) o 14,3 g (220 gr sub)
- Typical muzzle velocity
- 700 m/s (super) – 300 m/s (sub)
- Typical energy
- ≈ 1700 J
- Introduced
- 2011
Pros
- +Compatible with AR-15 lowers and STANAG magazines.
- +Excellent suppressed performance with subsonic loads.
Cons
- −Risk of confusion with 5.56 (catastrophic).
- −Effective range below 5.56 in supersonic loadings.
History and use
Born from a USSOCOM request for an M4-platform replacement of the 9 mm MP5SD. Widespread in U.S. civilian/tactical market, adopted in small quantities by SOF units.
Weapons adopting it (2)
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