by Detroit Ammunition Company|Item # GLA300BLK220SP



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Manufacturer: Triple R Munitions
Condition: Factory Remanufactured 
Bullet Weight: 220 Grain 
Bullet Type: Spire Point
Ammo Casing: Brass 
Ammo Caliber: 300 AAC Blackout
Primer Type: Boxer 
Velocity: 1050 Ft/s

No surplus powders or primers are used to build our ammunition.
The powders that are used are often better than those of many OEM manufacturers,
producing the best subsonic round available!


The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P., also known as 7.62×35mm is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. Its purpose is to achieve ballistics similar to the 7.62×39mm cartridge, or even more similarly, the 7.92×33mm Kurz cartridge in an AR-15 while using standard AR-15 magazines at their normal capacities. 300 BLK ammunition cannot be used in a rifle chambered for 7.62×40mm Wilson Tactical. It is mainly derived from the .300 Whisper concept, but differs in having been submitted to the SAAMI.

While 5.56×45mm NATO has enjoyed widespread acceptance in military circles, the nature of the missions encountered by some special operations groups often demand a round that provides better performance than that available in the high-energy, standard velocity rounds, and subsonic performance greater than standard 9mm (the ubiquitous pistol round also commonly used in many SMGs.

To meet this demand, AAC developed the 300 AAC Blackout in cooperation with Remington Defense. The new cartridge was intended to negate many of the perceived drawbacks inherent to other large caliber cartridges used in the M4. Colt Firearms and other arms makers had previously chambered AR-pattern rifles and carbines in various .30 caliber rounds but encountered problems. In the case of the 7.62×39mm, its relatively severe case angle caused feeding issues unless specially modified AK-47 magazines were used, and even then results were unsatisfactory. Modified bolts were also needed owing to its larger case head diameter. Rounds such as the 6.8 SPC and 6.5 Grendel had similar parts-interchangeability issues but did allow for the use of the standard M4/M16 30-round magazine, albeit with a reduced capacity.

Additional information

Weight 1.4 lbs
Dimensions 2 × 2 × 2 in

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5 reviews for SUBSONIC 300 AAC BLACKOUT 220gr SP

  1. sjschofield74 (verified owner)

    Subsonic, nice and quiet. They won’t cycle my AR un-canned, but with the can on, out of a 16″bbl they’re silent and actually cycle the rifle. Mine came with a HPBT bullet, put three out of 5 rds on their business card at 75yds, held a 4″ group at 100yds, very satisfied. Bought some stuff off the shelf at the local gun store and they barely held a 12″ group at 100yds, so I’m pretty sure this is good ammo. Will buy again, and highly recommended.

  2. popshollen (verified owner)

    Ordered this for a hunting round all the ammunition I’ve ever bought that says SP stands for soft point someone else please comment this was a full metal jacket we’re not close in a CZ bolt action rifle Charlotte $50 cap about a 6-inch group wolf will shoot 2 at a hundred yards be lucky to keep a foot group suppressed went to 18 to 20 in junk I would not recommend this to anyone buyer beware

  3. croft.swanson (verified owner)

    This ammo is great – I’ve had problems with my 300 BO subs going supersonic, but didn’t have problems with these. They stayed subsonic and functioned wonderfully. Try them you won’t regret it.

  4. Timothy

    Great product, fast shipping, overall very happy!

  5. Seth

    Excellent ammo! fast shipping! over all. Very happy!

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