Introducing AT3 ARO-MINI Red Dot Sight – Now Available!

.300 Blackout AR-15 Parts - Barrels, Muzzle Brakes, and More

If you’re looking for a harder-hitting cartridge for your AR-15, .300 Blackout is the go-to.  This was designed to have performance similar to 7.62×39, without needing a bunch proprietary parts.

You can use the same bolt carrier group and magazines as your traditional AR-15 – the only real difference is a READ MORE

Filter
Sort
LIST
 
Breek Sale!
 
Breek Sale!
 
Breek Sale!
 
Breek Sale!
AT3™
300 Blackout Sale!
AT3™
300 Blackout Sale!
 
RECOMMENDED
300 Blackout Sale!
 
300 Blackout Sale!
AT3™
RECOMMENDED
300 Blackout Sale!
 
300 Blackout Sale!
 
RECOMMENDED
300 Blackout Sale!
 
300 Blackout Sale!
 
300 Blackout Sale!
 
300 Blackout Sale!
AT3™
300 Blackout Sale!
AT3™
300 Blackout Sale!
 
300 Blackout Sale!
AT3™
300 Blackout Sale!
 
300 Blackout Sale!
 
300 Blackout Sale!
 
300 Blackout Sale!
 
RECOMMENDED
300 Blackout Sale!
AT3™
300 Blackout Sale!
 
300 Blackout Sale!

Other Shop by Caliber:

Join the AR team and Never miss a deal!
Sign up for the AT3 newsletter

News, special offers, exclusive discounts, and more!

Please enable JavaScript in your browser to complete this form.

We respect your privacy. WE WILL NEVER SELL YOUR EMAIL OR SEND YOU SPAM

Reviews

See what our customers are saying about us!

AT3’s instructional videos on every aspect of the AR15 are invaluable. I watched them all on YouTube over the past week, and my first AR15 is being delivered today. I am looking forward to tinkering with my new rifle using AT3’s knowledge base as my guide.

~ John E.

First I wanna say amazing customer service my items arrived really fast and packaged very safely. Second the FDE is a perfect match for Magpul products. I paired my AT3™ FF-ML 10.5″ Complete AR 15 Pistol Upper with Franklin Armory lower with bfs||| trigger .. AMAZING! GOT A FOREVER CUSTOMER HERE AT3!

~ Joshua H.

I've ordered a few times from these guys. Prices are great. Things ship fast. Like next day shipped out. Can't ask for more! Also, their AT3 line of products are legit.

~ David J.

I ordered from AT3 for the first time on Monday and I received my order today (2 days later). When a lot of companies are making excuses for long turnover times, AT3 provides top notch customer service and very fast shipping.

~ Brian M.

If you’re looking for a harder-hitting cartridge for your AR-15, .300 Blackout is the go-to.  This was designed to have performance similar to 7.62×39, without needing a bunch proprietary parts.

You can use the same bolt carrier group and magazines as your traditional AR-15 – the only real difference is a barrel for the .30 caliber bullet.  Beyond that, you can use all your favorite AR receivers and accessories to shoot this caliber.

.300 Blackout also suppresses rounds beautifully, and is ideal to be used for a short barreled-build.

Back to top