Spike's Tactical 16" 5.56 M4 Carbine Length AR-15 Barrel

Manufactured by Spike's Tactical
SKU: SB51605-M4
MPN: SB51605-M4
Manufactured by Spike's Tactical
34 Reviews
$211.50 $287.96

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



The barrel is one of the most critical components of your build. We only offer high quality barrels so you can be confident that your rifle will be off to a good start with whichever you decide.


  • MIL-STD-171 phosphate finish on the barrel exterior.
  • 1:7 twist rate.
  • 1/2x28 thread pitch.
  • MIL-STD-171 hard chrome bore 5.56mm NATO chamber.
  • All chambers are checked for head spacing before and after plating.
  • High pressure tested and magnetic particle inspected.
  • Threads are cut concentric to the bore.
  • Uses .750" gas block.
  • Weight: 28.0 oz.
  • Spike's Tactical lifetime warranty.

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Barrel CoatingManganese Phosphate
Barrel ContourM4
Barrel Length16
Barrel LiningChrome
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandSpike's Tactical
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthCarbine
Manufacturer.Spike's Tactical
Thread Pattern1/2 X 28
Twist Rate1:7
Weight28 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

Ratings & Reviews

34 reviews

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Spikes Tactical Barrel ST-16" M4 LE-5.56


Barrel was perfect just as described super fast shipping will buy here againthank you Primary Arms

Good high grade M-4 carbine replacement barrel.

by -

Better materials and workmanship than the original plus 1/7 instead of 1/9 rifling and chromelined.

Need a new review?


Yep. This barrel is still a great option for your build- although not the prettiest. Take a few minutes to pick out the manufacturing "gunk" out of the chamber area before install. The M4 feed ramps line-up with multiple uppers perfectly (Aero, Spikes, Stern). Did not work well on an Anderson upper- but I've only ever tried one. Fitment is snug, but not freeze the barrel and heat the upper tight- more like put some muscle into it- or tap it with a rubber mallet tight. I've used this barrel in quite a few carbine builds- and none of my rifles or my teammates' rifles have had issues- all producing good tight groups at the range. I'm up to a few thousand rounds on mine, and still going strong- rifling still looks good and the chamber still looks brand new (ish). Good price on a very good barrel. PA will have it at your house almost as fast as you can hit submit on your order.

great for fist time builders

by -

I got this barrel for my first AR build and I got to say its a great barrel for the price! well made and very accurate! The only thing you have to do if you choose to do so is dimple the barrel it does not come pre dimpled other then that a great choice.