5.56 20″ Heavy Barrel, Assembled Front Sight – Rifle Length

Rated 4.75 out of 5 based on 8 customer ratings
(8 customer reviews)


  • CALIBER: 5.56 NATO
  • TWIST RATE: 1:9
  • MATERIAL: 4150 Chrome Moly Vanadium
  • FINISH: Parkerized
  • GAS SYS: Rifle
  • MUZZLE THREAD: 1/2×28
  • INCLUDES: A2 Front Sight Base With Sling Swivel, Triangle Hand Guard Cap, & A2 Barrel Nut
  • ADDITIONAL SPECS/NOTES: Barrel is compatible with .223 Ammunition.

Out of stock

UPC: 640901516936 SKU: B2-K650-A004 Category: Tags: , , , , , , , , , , ,


The 20″ 5.56 NATO Heavy barrel  assembly 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 rifle length gas system with a .750″ gas port and a 1:9 twist. This barrel comes assembled with an A2 Barrel Nut, Triangle Hand Guard Cap, A2 Front Sight Base with Post & Detents, Pinned & Drilled with a Front Swing Swivel.  This barrel provides top accuracy and precision for your 5.56 build.



Additional information

Weight 4 lbs
Dimensions 30 × 3 × 3 in

8 reviews for 5.56 20″ Heavy Barrel, Assembled Front Sight – Rifle Length

  1. Rated 4 out of 5

    Edward Watson

    Fantastic barrel, especially for the money. Easy install and shoots great! I plan to buy another for the next build.

  2. Rated 5 out of 5


    Arrived in perfect condition, on time and at a great value. I will be purchasing from Anderson again

    • Michael Johnson

      We are glad we could help you out.

  3. Rated 5 out of 5


    Awesome barrel, worked great for the m16a2 clone I did!

  4. Rated 5 out of 5


    The wording in the description isn’t clear enough for me to commit quite yet. Does this come with all of the items listed? Barrel, gas tube, barrel nut, Triangle handguard cap, a2 front sight, all installed and ready to mate to an upper and have a handguard thrown on there and be done? I’m not going to need to dig through local shops for a pin or tube for the gas system or order and wait for a barrel nut assembly or anything else?

    A picture of everything the listing includes would actually probably answer all of my questions though…

    I’ve bought the parts two build like two and a half guns and a total of 4 lowers from ya’ll before though so I have no problem throwing a 5 star on this as there’s not a question section for specific products. but the website could really use some tidying up with pictures of items for sale. I struggle to commit without having a picture I can save and compare to what I receive to make sure nothing got lost and to make sure I order everything I need to justify the shipping.

    Regardless, you guys do great work, I hope I can get some help making a few very fine Anderson AR15A4CC (Civilization Clone) for my self and either my dad or brothers, depends on which one has the best reaction when I show them mine when it’s done.

    Thanks again!

  5. Rated 5 out of 5


    INCLUDES: 20″ Heavy Barrel, A2 front sight with bayonet lug and sling swivel, barrel nut, triangular hand guard cup.

    DOES NOT INCLUDE: gas tube (rifle length), muzzle device (flash hider), Delta ring.

    it would serve us customers better if the listings on this website were itemized and included pictures.

    BUT STILL, i got what i ordered in less than a week, all the parts were new, fresh and in great condition, i just wish i had known about the other three parts i was going to need to finish my M16A4 clone.

    • Michael Johnson

      thank you for the information

  6. Rated 5 out of 5

    Bon ron

    Any pictures?

    • Michael Johnson

      We are working on getting all of our pictures updated

  7. Rated 5 out of 5

    Terry Stevens

    SKU: B2-K650-A004

    Love my 2 Andersons. I am building a 3rd with wood furniture. I need this barrel to continue. Where can I obtain this. Thank you.

    • Tom Steffner

      2 weeks

  8. Rated 4 out of 5

    Paul Comer

    I have been looking for this barrel for my M16 Vietnam Era replica build. I do have a question regarding the barrel extension. Does it have M4 feed ramps?

    • Michael Johnson

      Yes the barrel has M4 feed ramps in it

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