.308 Win. 20″ Heavy Barrel – Rifle Length

Rated 4.10 out of 5 based on 42 customer ratings
(42 customer reviews)


  • CALIBER: .308 Win.
  • TWIST RATE: 1:10
  • MATERIAL: 4150 Chrome Moly Vanadium
  • FINISH: Parkerized
  • GAS SYS: Rifle
  • MUZZLE THREAD: 5/8-24
  • TREATMENT: Non & RF85
  • ADDITIONAL SPECS/NOTES: Barrel is compatible with .308 Win. & 7.62X51 NATO Ammunition.
UPC: N/A 712038922208 640901515182 SKU: N/A Categories: , , Tags: , , , , , , , ,


We recommend using the 15.5 inch overall length gas tubes

Additional information

Weight N/A
Dimensions N/A

Non-RF85, RF85 Treated

42 reviews for .308 Win. 20″ Heavy Barrel – Rifle Length

  1. Rated 5 out of 5

    Eric Lehman

    Barrel came super fast. Fit in my dpms upper perfect zero play. Finish was also perfect. Can’t beat the price.

  2. Rated 5 out of 5


    This barrel is a tack driver! I just put it on and fired it today, the barrel was super accurate and great quality. No complaints here and only selling for $106 are you kidding me?

  3. Rated 2 out of 5


    was informed by retailer the 20″ barrel, which was returned due to head space failure, was an Anderson. Stamped 7.62 x 51 NATO on forward half. Barrel would not allow bolt to close and lock on a Forster Minimum head space gauge. However it did allow chambering of BOTH 7.62 x 51 Federal NATO ammo and Win. 308-very tightly. Forster informed me that failure on the min. gauge is a dangerous situation and should not be fired-which it has not. Very disappointed but safety first. I’ve had one carbine round explode in my face before scattering the breach, bolt and casing shrapnel so lucky to still have both eyes. When in doubt folks don’t squeeze the trigger. Anatomy is something you only get once.

  4. Rated 5 out of 5

    steven Browning

    Installed this barrel using Palmetto State Armory components……upper receiver, bolt carrier group. Have only fired at 50 yards, but I have produced several one-hole three shot groups……….For the price and quality, this barrel cant be beat.

  5. Rated 5 out of 5


    Install barrel on my PSA upper fire 40 rounds works great perfect repeat can’t wait to buy another

  6. Rated 5 out of 5


    Fast shipping. Nice finish, barrel markings, M-4 ramps, looks good. Will check headspace, let’s go shoot it, report later.

  7. Rated 5 out of 5


    I was wondering, of you that actually have this barrel.
    It states 20″, is it really 20″, or does it measure out at 18″?
    I bought a complete upper off Gun-broker, and it is 18″ not 20″
    as it was advertised. Sent it back for a replacement, they sent the
    same thing, only a bit more beat up, scratched up so I sent it back.
    Now looking for a measured 20″ .308 barrel.

    • Tom Steffner

      We have booth 18″ and 20″

  8. Rated 3 out of 5


    Why is the 20″ 308 barrel cheaper than the 18″

  9. Rated 5 out of 5

    DCS Shooting Components

    I am a 12 year veteran of the US Army as a sniper scout. I like shooting the AR 10 platform at long ranges I bought this barrel to try out figuring for 106.00 if it was a big fail I was not out much money. When I recieved the barrel I laped the barrel and cleaned it, then installed it. We went to the range and broke in the barrel with 5 one shot clean then move up to 5 shots and clean and finally 10 shot clean. Then the rife was shooting sub MOA at 200 meters then we stretched it out to 800 meters which we had a 2.5 in group. Guys this barrel is a great barrel for the price you can’t go wrong. You don’t have to lap the barrel but I do with every rifle I own that’s just me.

  10. Rated 5 out of 5


    Great barrel….. but i have had some issues, first is it a AR10 Armalite rifle length 15.5″ gas tube or AR15 rifle length gas tube 15.25″(a DPMS brand 308 12″ handguard had a .25″ gap to the gas block)? and is it a AR10 or DPMS 308 barrel extension(BCG are different for both styles of AR308 rifles)? then can it run .308 ammo or just 7.62 x 51 NATO as the barrel is stamped(description says .308)?

    • Tom Steffner

      It can run both types of ammo

  11. Rated 5 out of 5


    Barrel shipped real fast.Fit perfectly on my PSA PA10..Haven’t shot it yet but it seems to be excellent quality and is reasonably priced! Happy with my purchase

  12. Rated 5 out of 5

    Tom Carter

    I need to know which gas block to use for this barrel. I thought it said .750 gas system but in the comments it said the .750 gas block would not work. can anyone help?

    • Tom Steffner

      It’s a .750

  13. Rated 5 out of 5


    This 20″ 308 hbar is a very good barrel. It has a nice finish, it fit well in PSA upper receiver, 1.5″ group @ 100 yards with PMC fmj. Now that it’s broke in I’ll run some better ammo through it and see if I can tighten it up.
    If your on the fence about ordering this, do it. Well worth it.

  14. Rated 4 out of 5

    Mitchell Shelton

    Can I shoot 7.62×51 through it thanks

    • Tom Steffner

      yes sir

  15. Rated 5 out of 5


    Was looking at this barrel and was wondering if its DPMS compatible with a DPMS bolt carrier group?


    • Tom Steffner

      Yes Sir

  16. Rated 5 out of 5


    Dropped in my DPMS style upper works with dpms style BCG everything fit perfectly installed JP adjustable gas block and tube cant wait to get it to the range

  17. Rated 5 out of 5


    Tack driver. Installed on a PSA PA-10 upper, with a Toolcraft BCG. Headspace checked out fine. Lockup was crazy tight with that particular BCG (it took 2 hands yanking on the charging handle to pull back the bolt). Wearing it in required a lot of oiling and 30 rounds. At 100 yards with Remington UMC, it produced a 1″ group, without a proper rest (or proper eyes, for that matter). Installs using an AR-15 rifle length gas tube, .750 gas block, and DPMS spec .308 barrel nut, with AR-15 barrel nut outside dimensions; BUT bear in mind that the barrel is too thick to use a standard AR-15 barrel nut wrench, of the type that uses pegs to grab the nut. You must get a wrench that interfaces with the outside crenelations of the nut, or that has an abnormally wide mouth. The studs on the wrench are the correct distance apart to grab the nut, but the mouth of the wrench might not be wide enough to fit around the barrel (found that out with the $40 Wheeler Engineering tool/torque wrench combo).

  18. Rated 2 out of 5


    Now that I have it working it is very accurate. It was shipped super fast, packaged very well and looked great coming out of the box, installation was a snap.

    Then when checking headspace it was REALLY tight. Test firing led to short stroking and failure to extract and having to use a rod to hammer the shells out of the chamber.

    End result was taking the complete rifle to my gunsmith, to find out that the chamber was not within .308 spec and had to be reamed and polished, the gas port was also 0.085, and this was bored over to 0.089, and things were a lot better. Then I noticed that the rifle length gas tube was too short and not engaging the gas key fully. Double checked the gas port, all lined up perfectly. Measured the gas tube at 15.125″ and found it needed 0.375 more inches to seat in the gas key properly. I had to then find an Armalite AR-10 length gas tube. Once this was installed suddenly the rifle shoots really tight groups with no issues, even with crappy ammo.

    I Spent over double what the barrel cost to make it work. I could have bought a “higher” end barrel for what I spend total (total cost is over double what the barrel cost me). If it was not so accurate it would only be a 1 star. I would only recommend this barrel if you are able to measure headspace (and correct it as needed), measure gas system length and measure the gas port. This was not a ready to use barrel for me, very disappointing,

    • Michael Johnson

      What was your order number for the barrel?
      Please let us know what we can do to help you out.

  19. Rated 2 out of 5

    Roger Morgan

    I bought this barrel from Anderson and the rifle length gas tube. So far I still do not have a rifle that will cycle correctly. The first thing Anderson did was send me a carbine length gas tube instead of the one that I ordered. I contacted them and they sent me the rifle length gas tube. It was 15.125″ long and an AR-15 gas tube. After assembling the rifle and struggling with it short cycling just like a few other reviewers, I realized the gas tube was not long enough. There are 2 types of barrel drawings for the AR-10. One is the Armalite and one is DPMS. They are about .250″ different and this Anderson barrel takes the longer Armalite gas tube which is 15.5″ long. I am still waiting for a remedy from Anderson Rifles. I cannot comment on the accuracy of this barrel since I cannot enjoy it yet.

  20. Rated 2 out of 5


    Should be specific on gas system length. Needs Armalite tube. Pretty disappointing. Would not have bought this, pain finding an Armalite tube. Was trying to stay all DPMS.

  21. Rated 4 out of 5


    I had one similar issue other reviewers have had. I built an AR308 with a MEGA upper and lower combo and I was using an aero precision nickel boron bcg. The first round in the chamber fired but did not extract. It was stuck so tight that my extractor literally ripped the section of brass it grabbed onto right off. Luckily for me my extractor didn’t get damaged. After leaving the range somewhat pissed I decided to take some degreaser, douse a bore mop, attach the bore mop to an electric drill, and go to town on the chamber. After using the degreaser I than took some standard CLP and doused another bore mop and went to town on the chamber. Lastly I took some Hoppes 9 Lube and doused the bore mop one more time and went to town on the chamber, again with an electric drill. I went back to the range with the same .308 cheapo Remington ammo and prayed the damn thing would extract this time. Much to my delight, that rifle has now had 100 rnds through it without a hiccup. It only really cost me some time and discussion with some friends to figure out what the problem was. Overall I’m happy with the barrel and it’s been shooting 1moa groups at 100yds pretty consistently with shitty ammo and a vortex viper pst 2.5-10x scope. I admit that my extraction failure was probably my fault for not degreasing and lubing the barrel to begin with and it’s a good thing that the tolerances are pretty tight. As far as the gas tube issue that other reviewers have had, I purchased a standard rifle length ar15 gas tube and have not had the short cycling issues that others have had. Mine cycles very reliably and I’m using an A2 style buffer tube with a dedicated AR308 buffer and buffer spring. With AR pattern rifles there are a lot of moving parts and a lot of reasons to have feeding/extraction issues, it’s important to remember to think of the entire system and not just one part as potentially being the culprit. I would recommend this barrel to budget minded individuals who are looking to get decent results from an inexpensive part. If you want sub-moa results look forward to purchasing a whole lot more than just an expensive barrel.

  22. Rated 4 out of 5


    So I had issues with the rounds getting stuck in the chamber. I had a gunsmith review it and tell me to ream and polish it. I then wrote a note to Anderson.
    This afternoon I arrived home to find an Anderson box on my doorstep with a new 20″ 308 barrel. Despite tolerance issues with the barrel Anderson’s service is top notch. Super impressed!

  23. Rated 4 out of 5


    The barrel came in quickly and looks great. I am having trouble with the gas tube. I purchased the rifle length gas tube from Anderson but it seems short. I an using a DPMS upper and BCG. Does this barrel work properly with the 15.25 inch gas tube or does it require the 15.5 inch gas tube. In the comments I have seen people saying different things. Which Gas tube does this require?

  24. Rated 5 out of 5

    Danny Swanger

    First of all I have to say that this is for sure the best bang for your buck. I installed this in an Aero Precision matched upper and lower with a Daniel Defense 7.62 rail and Aero BCG. I started with cheap Perfecta ammo from walmart and produced sub moa groups at 100 yards. I then loaded some 175grn Siera Matchking BTHP with 41.5 grains of imr 4895 and put them all touching with every shot. this is an un-real deal and personally I feel like its under priced. if your skeptical of the accuracy for the price, don’t be.

  25. Rated 4 out of 5


    As the description says, this is an “AR-10” barrel with a “.308″ chamber. The most important part of this review or post is that this barrel requires an Armalite style rifle length gas system. You will need to purchase separately the Armalite rifle gas tube which is 15.5″ in length. A regular AR-15 or DPMS rifle gas tube will be about 3/8″ (or 1/4”) too short.

    The contour of this barrel is what makes it Armalite. The ring where the hand guard cap go and then gas port are positioned a little further from the barrel extension than they would be on a DPMS .308 barrel. This is actually a good thing because that makes this barrel compatible with M-16/AR-15 rifle length hand guards. I’d recommend the triangular hand guard cap. Those with DPMS barrels have many issues finding proper rifle length hand guards. People have even tried to trim down their plastic classic hand guards to make them fit. That should not be an issue with this barrel.

    I’ve dry test fitted classic hand guards on this barrel and they seemed to fit just fine. The method was to drop down the appropriate barrel extension and hold the triangular hand guard cap in place while inserting the plastic classic AR-15 rifle hand guards.

    I would suspect that if you’re building your .308 upper with a DPMS “high” rail, you can use hand guards intended for Armalite AR-10 based builds. Midwest Industries has their aluminum quad-rail drop for AR-10s (GZ-MIAR10RHG2). This should be able to be an option for this barrel. These should match the rail height of the DPMS “high” style upper, which also should match the same rail height as the SR-25 and AR-10 upper receivers.

    The features of this barrel make it good for both DPMS and Armalite builds. Remember to purchase your 15.5″ rifle gas tube and ensure you have a .308 based bolt. Anderson sells .308 BCGs.

    Since I haven’t had a chance to shoot this barrel yet, I can’t give it the full five stars. I look forward to it though, based on the other reviews.

  26. Rated 1 out of 5


    Ordered my barrel in June and received it a month later, blemished but, not a problem since It would be covered by the hand guards. The barrel head spaced Go and No-go. The rifle failed to cycle right away. I figured the Gas block alignment was off so, I realigned with appropriate alignment pin. Still wouldn’t cycle. I reinstalled a new gas block and tube. Then realigned. Still didn’t cycle. After much research I decided to revisit the reviews here. Ah! It requires a longer, Very hard to find Armalite ar-10 gas tube. At this point I decided I needed to contact Anderson with my issue and order number. Have not heard a word from them since. Found the Armalite gas tube. Reinstalled and realigned. Still would not cycle. Now the problem has to be a flaw in the gas port hole. I ordered another 20″ barrel from a different manufacturer. The gas port hole is significantly bigger. Installed this barrel with my original gas block and the standard rifle length gas tube I got from Anderson that was supposed to work with their barrel. And like magic, runs flawlessly. Cycles 150gr, 180gr and locks back on empty. Now I’m stuck with a barrel that needs to be redrilled, is no use to me and extra parts. For those that might run into this problem, the gas block alignment pin the Anderson barrel took was third smallest. The alignment pin for the second barrel that worked, was the second from largest.
    I’m glad that most people here have gotten a good deal and a pleasant experience with Anderson. I had hoped to experience the same. Lesson learned for me.

  27. Rated 4 out of 5

    Derek C

    I posted before. Now just posting an update. I Found a Gas Tube supplier.
    Fulton Armory sells a 15.5 inch gas tube on their site. The FA-TU-062.
    This makes finding the tube a lot easier. I was about to resort to having Kreiger make me a custom one.

    Hope this helps.

  28. Rated 5 out of 5

    Jamie S

    Simple question here. Will a dpms bolt work in your ar-10 barrel extension that’s on your .308 barrels

    • Tom Steffner

      yes Sir

  29. Rated 5 out of 5


    Does this barrel take a DPMS or Armalite length gas tube?

    • Tom Steffner

      rifle length Armalite

  30. Rated 5 out of 5


    Will this barrel work with a piston set up and can it take a suppressor

    • Tom Steffner

      No Sir

  31. Rated 5 out of 5


    Why doesn’t Andersen sell the barrel and include the Armalite Rifle Length Gas Tube. That would eliminate a bunch of drama. It is not a common gas tube to find. FYI: DSG Arms has some Armalite Rifle Length Gas Tubes 15.5″ in stock for $17.00 and they will ship just about anyway you want it. They are out of Ft. Worth. Part#: ARM10007010. Have not shot it yet so I have nothing to report except it looks good after you clean it up a little. Everything is to specs. We will see. The shipping was fast so right now they get five stars all subject to change.

  32. Rated 5 out of 5


    I had built 5 AR 10 type rifles and had a bunch of parts and a spare PSA upper/lower combo and thought “I’ll just build the cheapest LR 308 I can and see how it compares with my megabuck builds”. I found this barrel and an adjustable gas block on this site. Generally speaking, an AR 10 type build would make a preacher cuss but this was a multiple problem build from hell! The weapon just would not cycle reliably. (Other problems were: bolt carrier – gas key staked but screws not tightened first: Defective 308 buffer spring (PSA) could have been used on a freight train suspension. Replaced with DPMS – now smooth as glass.) I realized (by comparison to my other builds) that the gas tube was too short. I sent Anderson an email on 4/19/16 requesting info if this barrel was cut to DPMS or Armalite pattern. Response was DPMS. I then sent them pictures of the installed gas block and chamber area and a BHW barreled build on the same setup which clearly showed the length difference. Never heard back. I ordered an Armalite gas tube and enlarged the gas port and miracles occurred. After getting this mess ironed out and honing the barrel I was shocked to see 1/2″ to 3/4″ cloverleafs from a lead sled at 100 yards. Now I see from the other reviews that I was the only one the country that didn’t know about the gas tube BS. I gave it 5 stars because I just love a challenge!

  33. Rated 5 out of 5


    Which Gas block and gas tube should I buy with this barrel

  34. Rated 5 out of 5


    I’m in the process of building a AR 10 from PSA I got the upper got the lower just need BCG and barrel. Been looking at this barrel for 2 weeks now but I need to no what my best option is on where I get my Bcg. I want it to match up with this barrel good.

    • Michael Johnson

      just put some more in stock
      get them before they go out of stock

  35. Rated 1 out of 5


    Just opened my package and realized instead of my twenty inch barrel I ordered I have received a cheaper eighteen inch barrel with a mid length gas system, after I went through the trouble of tracking down an armalite gas tube.

    • Michael Johnson

      someone from customer service will get with you today about this.

  36. Rated 5 out of 5


    Awesome barrel!
    I ordered this barrel to put on my first AR-10 build. I don’t want anything too expensive just in case
    I messed something up. It was delivered within a week. I also ordered thee gas tube from Anderson since a lot of the reviews said they had problems finding the correct one. I took it to the range today and it performed flawlessly. I followed the break in instructions that customer service recommended and I was getting 2 inch groups by the time I was done.

    • Michael Johnson

      Glad the barrel worked out for you

  37. Rated 5 out of 5


    Back orders accepted?

    • Tom Steffner

      Sorry not at this time

  38. Rated 3 out of 5

    Douglas Stahl

    I have purchased two of these barrels and like others have experianced short stroking of the bolt carrier. So on the newer barrel I installed an Armalite gas tube. Guess what – same issue as the barrel with the standard tube. So, I thought maybe it was the buffer and spring I was using, but it did the same thing with a factory DPMS lower that has no issue on its factory barrel. Since I also have an Anderson 18″ with a standard mid length tube the logical answer is that it is not the gas tube length, but the gas port size that is the issue. I have mentioned this to Anderson previously twice and they will not respond. Likely they will delete this post as well.

    • Michael Johnson

      We will have a customer service rep get with you on this issue.

  39. Rated 3 out of 5

    Earle Bartolome

    Not a review but, a question to Anderson. Have the problems listed above been addressed?

    • Michael Johnson

      What issues are you having?
      The barrel is good

  40. Rated 3 out of 5

    Earle Bartolome

    I wanted to know if it’s the same barrel that requires the longer armalite gas tube and if the gas port is the correct size. These issues were brought up in previous post by other reviewers. I just want to make sure I know what I’m getting into before I make the puchase.

  41. Rated 5 out of 5


    Expanding on a previous review/post.. Why all the hubbub over the longer gas tube? For the curious, what makes the .308 barrels require the longer Armalite gas tube is that the .308 barrel extension is longer. When you line up a 5.56/.233 AR-15 barrel next to a 7.62×51/.308 barrel, you’ll notice the barrel extensions have a difference in length of .25″. That’s the Reader’s Digest version.

    The .308 barrel extension has a longer reach into the upper receiver, pushing the gas port further away by 1/4″. The standard AR-15 gas tube is designed to accommodate AR-15 barrels and is calibrated to enter a specific distance into the upper receiver. The open end of the gas tube should land right in the middle of that half-moon cavity, designed to accommodate the movement of the bolt cam. Pardon, I don’t know the proper term. As the .308 (AR-10, LR-308, SR-25, etc.) barrel extension is longer, the AR-15 gas tube falls short .25″ accordingly. This as well as other potential factors (e.g. gas port size) can suffer as a result. Making note of the bolt cam cavity is just an eyeball measurement for gauging the distance the gas tube protrudes into the upper receiver.

    The solution is to have a gas tube that not only is designed for the length of the barrel but also that of the barrel extension. People tend to assume all 20″ barrels are the same. The “barrel length” is not measured from the total end to end. It is measured from the tip of the barrel to the end of the barrel itself, BEFORE the barrel extension is mounted. Barrel extensions removed, the rifle length AR-15 and AR-10 barrels would be the same length. After the barrel extensions are mounted, you’d find the AR-15 20″ barrel total length as being 20.25″ and AR-10 20.5″ respectively. Reiterating, due to the longer length of the AR-10 barrel extension, a longer gas tube would be beneficial, if not necessary.

    I would assume the same measurement considerations would apply to carbine and mid-length .308 barrel arrangements. If it’s a .308 barrel, be sure to hunt down the appropriate 1/4″ longer gas tubes.

    My suggestion to Anderson and any other retailer would be to stock these parts, should they sell any barrel that has a AR-10 or .308 specification barrel extension. They will save the buyer loads of hair pulling and grief. I hope this helps the buyer with questions they may have regarding this and other .308 AR platform barrels.

  42. Rated 1 out of 5

    Alex Liu

    I’m disappointed with the Anderson 308 20″ I purchased from a seller on ebay. My mistake was that I didn’t check headspace on it until after I have already dimpled the barrel for the gas block. Bottom line, even after careful cleaning of the chamber the bolt doesn’t close on a 308 go-gauge.
    Not certain if I should contact the ebay seller or Anderson or if either would do anything since the barrel has been modified.

    • Michael Johnson

      was this just the barrel?
      I would contact seller first since there is where you had the money transaction.
      If that does not help contact us and we will see what we can do.
      Is this our barrel?
      Is this barrel new?

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