Anderson Manufacturing 5.56 Carbine Length M4 Contour AR-15 Barrel 1:8 Twist Rate - 16"

Manufactured by Anderson Manufacturing
SKU: AM-04-16M4-1-8
MPN: B2-K004-AN08
Manufactured by Anderson Manufacturing
18 Reviews

In Stock

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The Anderson 16'' 5.56 NATO Barrel is machined from 4150 chrome moly vanadium steel with a parkerized finish and an M4 contour, reducing weight where it matters for a balanced build. Capable of chambering 5.56 NATO and .223 Remington, this barrels 1:8 twist rate is ideal for a wide variety of projectiles from 45 to 77 grains.

  • 16″ 4150 chrome moly vanadium M4 Contour barrel with parkerized finish
  • Chambered in 5.56 NATO with a 1:8 twist rate
  • Carbine length gas system
  • .750″ gas seat diameter
  • 1/2x28 muzzle thread
  • Non RF85 treated

Anderson Manufacturing builds rifles, pistols, and parts utilizing the latest in computerized manufacturing. By keeping manufacturing in house, Anderson can offer quality, American-made products at an affordable price, backed by a limited lifetime warranty.
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Barrel CoatingParkerized
Barrel ContourM4
Barrel Length16
Barrel Material4150 Chrome Moly Steel
BrandAnderson Manufacturing
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthCarbine
ManufacturerAnderson Manufacturing
Thread Pattern1/2 X 28
Twist Rate1:8
Weight2 lbs
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

18 reviews


Supreme Quality and Accuracy.


I built up a plinker AR15 with this barrel. It is insane quality for the price. With a little over 1200rnds through it now, it is turning in consistant 2MOA groups at 100yds with a non magnified Vortex StrikeFire.
This session was shot today 10/26 in 50degree downpour rain,at 100yds, sandbagged of cement shooting table, for 90rnds I had a consistent 2" hole in the center of the target with a few flyers outside of that.
With a Burris 3-9X40AR scope it is turning in 1/2 MOA groups. Both sessions were shot with the same lot of Am Eagle 55gr FMJ red box.
This session was shot July 9th in 75 degree weather sand bagged off a cement shooting table.
I have other "Premium" Ar's that don't shoot that consistently
You cannot go wrong with this barrel, for quality.
I have two more in storage for future builds.

Excellent barrel with good ammo


Like this barrel really well.Shoots 1/2" moa at 100yds with 55gr austrailian outback ammo.3x9x50 cheap tasco scope on ar15.
Hard to beat for the money and accuracy!

Nice fit


Looks great. Fits perfect. Headspace is good to go. Can't wait to shoot it.

Perfect for my budget build, nice quality.


Very nice barrel, great price. Fits perfect with my Anderson upper (purchased here on sale). Fast shipping. A+ for these guys.

Scuffed exterior; Not a beauty queen.

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I had to double check my order because both barrels i received were scuffed up and i thought maybe id purchased a blemished item. Nope, they just looked like they had been used in a build. The barrel was at least clean and looked straight.


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Nice looking barrel. Snug fit in a Anderson Mfg. stripped upper. No complaints, Just finished build, and I have yet to be able to get to the range to be able to report accuracy. To be completely honest, if it couldn't hit the blind side of a barn I would still be happy with it because it went on my first complete build!

Get it

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Just getting mine broke in and it's way more accurate than I will ever be and as always great price and service from primary arms love this site

The One To Buy

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I used this to build a rifle. It has performed beyond my expectations. Accuracy has been ridiculous for such an inexpensive barral. It is now my favorite rifle. ans i have some high end rifles. LWRC, Knights A, JP, HK. Do not hesitate to buy this barrel for a build.

Spend the extra money

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The headspace was horribly off. Three gunsmiths said I could not use the barrel.



Just checked the headspace on this barrel, unfortunately it is not within spec, not usable at all. Got this barrel practically for free as a it's just a nice paper weight.