.300 Blackout 10.5″ Heavy Barrel – Carbine Length

Rated 4.45 out of 5 based on 29 customer ratings
(29 customer reviews)


.300 Blackout 10.5″ Heavy Barrel – Carbine Length

  • BARREL LENGTH: 10.5″
  • CALIBER: .300 Blackout
  • TWIST RATE: 1:7
  • MATERIAL: 4150 Chrome Moly Vanadium
  • FINISH: Parkerized
  • GAS SYS: Carbine
  • MUZZLE THREAD: 5/8-24 (.308 caliber size)

Note: Please use 110-125 grain supersonic Ammo

In stock

UPC: 640901514994 SKU: B2-K004-C003 Category: Tags: , , , , , , ,


The 10.5″ .300 Blackout Heavy barrel is the perfect barrel to start your next build and add to your AM-15 collection. This barrel is made from 4150 Chrome Moly Vanadium Steel with a parkerized finish. Featuring a carbine length gas system with a .750″ gas port and a 1:7 twist, this barrel provides top accuracy and precision for your .300 Blackout build.

Additional information

Weight 1 lbs
Dimensions 11 × 1 × 1 in

29 reviews for .300 Blackout 10.5″ Heavy Barrel – Carbine Length

  1. Rated 5 out of 5


    this barrel rocks! great fit and finish. the right size gas port for a carb gasser. I used this barrel to build another Anderson pistol upper for my supersonic loads. the carb length gas system on this barrel is not ‘over gassed’ by the supers. my other Anderson pistol upper uses a pistol gas system barrel (other mfg) for my subsonic loads. both dedicated uppers run like sewing machines 🙂 contrary to all the hype about shorter is better in 300blk…. this 10.5″ is the barrel to use!

  2. Rated 5 out of 5


    I’m not really educated in weapons, so I was wondering if I have currently a .750 diameter gas block, am I going to be able to use this barrel?

    • Tom Steffner

      Yes you should be able to use your GB

  3. Rated 5 out of 5

    A Yang

    I have a low profile gas block system but it is carbine length will this work? Also is the above comment true as I also have a .750 gas the barrel states .125?

    • Tom Steffner

      Yes it should work

  4. Rated 5 out of 5

    A Yang

    So what is the difference between gas ports.? You’re saying that a .750 will fit a .125 like this barrel

  5. Rated 5 out of 5


    .125 is the size of the gas port ( the hole in the barrel at the gas block) .750 is the diameter of the barrel at the gas port. They are two different things Yes your .750 gas block and your carbine length gas tube will work on this barrel. Great barrel

  6. Rated 5 out of 5


    Anderson is the [email protected]#, I have ordered m16 bcg and they have functioned perfectly, no issues. With the prices Anderson has, you cant go wrong. Anything I need for my ar-15’s, 300 blackout, and my 308’s will be ordered from Anderson. Have even ordered a 80% anodized lower from them, milled it out and stuffed a cmmg trigger kit in it and I was off punchin holes in the paper. Everything I have ordered from Anderson was shipped faster than expected. Even with the heavy shipping load they advertised, These guys are of the chain. Even though it was a 5-7 day shipping, parts still arrived early. First opportunity I get, im gonna get one of there no lube riffles.

  7. Rated 5 out of 5


    Will this barrels .125 port work with the adams arms piston setup

    • Tom Steffner

      Sorry we can not answer that questions, we do not manufacture Adam arms piston upper, you should contact Adams and ask if our port size is correct.

  8. Rated 5 out of 5


    Anderson Rifles has become my new go to online AR parts store for a couple good reasons , First the prices are hard to beat , the quality I have seen on the items I have purchased are as good or better than some of the bigger name stuff . I bought this 300 black out barrel along with everything to I needed to finish the upper for around 150.00 shipping included . These guys sent the stuff out the next morn and I had it within 3 days of the order being placed . Don’t let the low prices fool you , because everything they sell is high quality , they are good people to deal with because they care about what they do and do it right …. Ive only fired my new 10.5 ” 300 Black Out a couple times so far and havent had time to dial in the optics , but with the iron sites It was dead on and ran flawless with the carbine system … Cant go wrong purchasing anything from these guys … Thank You Anderson for caring about your customers needs …

  9. Rated 5 out of 5

    Michael mendez

    I have a question Is this barrel chrome lined or melonite ?or something else

    • Tom Steffner

      Materia 4150 not chromed lined or melonite

  10. Rated 4 out of 5

    Michael mendez

    If it’s not chrome lined or any other coating would this effect the accuracy of the barrel ?or the longevity of the barrel?

  11. Rated 5 out of 5

    Michael mendez

    If it’s not having any coating would this effect the accuracy of the barrel ?or the longevity of the barrel?

  12. Rated 5 out of 5


    I’m interested in a SBR (with a form 1) and this barrel caught my attention. I was wondering about the carbine gas system. I am going to be shooting subsonic loads(208-245 gr @1050fps) with A1680 powder, through an AAC Cylone can( tax stamped cleared a couple weeks ago) Will the carbine gas work with this setup? Or do I need to go with the pistol gas?

    • Tom Steffner

      Carbine with an adjustable gas block

  13. Rated 5 out of 5


    Just to be sure, does a standard 5.56 BCG function with the 300 Blackout cartridge?

    • Tom Steffner

      Yes Sir

  14. Rated 5 out of 5


    I use this barrel for my supersonic loads only. The Remington supersonic ammo pidgin toes in the magazine, no bueno. The Sigs don’t jam using the BCM made for Blackout magazine. The Remington sub sonics won’t cycle let alone push the bcd more than halfway back with this barrel. I use the Anderson Adj gas block AND it’s cranked wide open and still no love for the sub sonics. So I use it for JUST supersonics (which is the reason I love this caliber anyway) and it works great. I found the Sig supersonic ammo with the BCM Blackout magazines run like a scalded dog in this gun. I order Anderson parts except for the back ends for the pistoles, and they run great. I am very happy with the blackout using this barrel for supersonics. Thank you Anderson Team for the great customer service!

  15. Rated 5 out of 5


    Which gas block model number do you recommend for this barrel? I plan on firing both subsonic and supersonic bullets, and using a suppressor.

  16. Rated 4 out of 5


    Hey Tom ,
    First off I gotta say you guys make some excellent products and anyone needing anything for your AR builds don’t hesitate to buy from Anderson they have quality parts top to bottom and real fast shipping …..
    Being this barrel is set up with a Carbine gas system and I want to run both Super and Subs , but mostly Supersonic being we can’t own a suppressor in Ka err Ca … What Buffer do you recommend , I’m having a problem with mine after the first round goes bang and empty is ejected it’s not chambering the next round ..pull the trigger and it goes click …….. Im fairly sure its a buffer issue as it ejects fine .. any help is appreciated

  17. Rated 5 out of 5


    This barrel is a shooter holds a vary nice group shoot with supersonic ammo and you will love it great product

  18. Rated 4 out of 5


    Is this barrel designed for a .223/5.56 round?

    • Tom Steffner

      No, it’s for the 300acc BO

  19. Rated 4 out of 5

    Virgil Cross

    M4 feed ramps ?

    • Michael Johnson

      Yes they do have them.

  20. Rated 3 out of 5


    I purchased a 300 blackout 10 1/2 inch barrel with the carbine in length gas tube I also used .750 gas block but my rifle won’t cycle using 147 grain ammo

    • Tom Steffner

      Your gas block dia. is to small

  21. Rated 1 out of 5

    thomas lowe

    will the carbine gas system cycle subsonic loads and how many grooves does the rifling have

    • Tom Steffner

      Best to use a pistol gas system for subsonic

  22. Rated 5 out of 5

    Justin Nicolson

    Can you guys make me a barrel with a 1\7 twist with a pistol gas system?? Pretty please!! You guys get the 5 because I love all my Anderson products

  23. Rated 5 out of 5

    Kenneth Smith

    My 14.5 Anderson (Pistol length) Barrel is Awesome,Will this cycle subsonic at Carbine length?

  24. Rated 3 out of 5


    I purchased this barrel and I can’t get it to run right because I’m not getting enough backpresser to cycle right. so I recommend getting the pistol gas barrel

    • Michael Johnson

      Yes we do agree the pistol gas set up are best for the 300 black out shorter lengths.

  25. Rated 5 out of 5


    Can I use a non-adjustable gas block or does it have to be adjustable?

    • Michael Johnson

      with this barrel and not knowing how you are shooting this we suggest adjustable

  26. Rated 4 out of 5

    Thayer Moeller

    Cycles the supersonic 125 as advertised. I’m wondering if opening up the gas port would help it cycle some of the larger/slower rounds. Otherwise I might look into handloading 110-125 grain rounds.

    • Tom Steffner

      Try an adjustable gas block.

  27. Rated 2 out of 5

    Kim Campbell

    Take seriously Anderson’s advice to use 110 or 125 grain ammunition. My build short stroked on anything over 110 grain. Ejection was at 5 – 5:30 and it would not lock back any magazine, even Magpul’s. Because the first reviewer did so well, I thought that I must have a gas leak in my system, but after 5 redo’s, I could not find a leak. I tried a Nemo Arms reduced buffer spring, but it was too weak to strip rounds from the magazine. I measured the gas port; it was 0.119. After one more recheck, I still could not find a leak and was seriously under-gassed. I reamed out the port to 0.125; no joy. When I reamed it to 9/64’s inch (0.140), voila. It would run 110 up to 150 grain ammunition and ejected to 3 o’clock. It cycled my 168 grain Sierra handloads but would not lock back the bolt (need more powder). I briefly considered using an adjustable gas block, but doubted it would help an under-gassed system.

    I am sure this post won’t please the Anderson folks, especially with my home gunsmithing, but I take full responsibility for and am pleased with my decision.

    If you must use a carbine length gas system and are content to only use 110 grain ammunition, this is a good barrel. Otherwise consider a pistol length gas system or be prepared to enlarge the gas port, especially if you want to shoot heavier ammunition.

  28. Rated 5 out of 5

    Michael Gomes

    a customer asked me to build him a 300black out, with a 10.5″ barrel.
    we started with an Anderson complete lower in FDE, topped it with the Anderson complete upper and Nickel Boron BCG and Ambi-Charging handle. I used this barrel for the build…OMG ! Its been a month since the customer took delivery and week he texts or calls with how much he loves it ! I helped him sight in his red dot and we were hitting the swinger on his steel targets at 60 yards. He sent me a picture yesterday, that he put a hole in the swinger from 100 yards with it. He took it out to 300 yards and was still hitting steel. He and I are both amazed at this round and performance Anderson parts

  29. Rated 5 out of 5


    Will this work with the 7.62 x 39 upper?

    • Michael Johnson

      this is a 300 blackout barrel. You would need a different BCG. the stripped upper would work.

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