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-556


This barrel came very fast considering the times we live in now. Very happy. Just what I needed to finish my build.

top quality Spike's


used two spike's barrels for my last two builds. easy to install with YHM gas blocks and YHM flash hiders. functioned great, but haven't had a chance to truly check their accuracy.



Very nice!!

Very pleased!!!!


Very pleased with the barrel and the speed at which it was shipped!! Very nice doing business.



Always a pleasure doing business with Primary Arms!

Excellent barrel and quality!!!


Excellent replacement barrel. The shipping was fast and the customer service is the best around!!!

good barrel


nice looking barrel. just what i needed... in stock and quick delivery!

Outstanding experience


Great experience with Primary Arms! This was my first order, and I received it in 3 days. I will definitely buy from them again.

spikes m4 barrell


the order shipped fast and was received as expected

Spikes Tactical Barrel ST-16" M4 Carbine LE-5.56


Barrel mounted on Aeropresion stripped upper with no problems. I shot 100 brass rounds through it this past weekend at the range with no problems. I would purchase again.