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Spikes Tactical 16in M4 LE- 5.56 Barrel Extension Up to 10% Off w/ Free Shipping — 3 models

Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block SB51605-M4G
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ FSP SB51605-M49
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
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Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
2 of 7 images
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block SB51605-M4G
3 of 7 images
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block SB51605-M4G
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ FSP SB51605-M49
4 of 7 images
Spikes Tactical Barrel 5.56 - 16in M4 LE w/ FSP SB51605-M49
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
5 of 7 images
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
6 of 7 images
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML
7 of 7 images
Spikes Tactical 16in M4 LE- 5.56 Barrel Extension, Mid Length, 16in, SB51605-ML

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Questions & Answers
Im looking to build a M4A1 clone . Is this considered Pencil or government contour? Is there a model with the A2 front sight base installed? Expert Answer

The Spikes Tactical 16in M4 LE- 5.56 Barrel model SB51605-M49 has the Front Sight Gas Block installed. These are government profile barrels.

by Hunter, Gear Expert, December 21, 2022
Barrel Extension? Is it not just a standard Barrel? Expert Answer

These Spikes Tactical 16in M4 LE- 5.56 Barrels are standard Mil-Spec AR15 barrels.

by Hunter, Gear Expert, December 15, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Fantastic Barrel by Dude, Verified Owner, September 17, 2020
These are my go to barrels on all of my builds. They are great quality, priced well, and very accurate barrels. The only barrel I would recommend over these would be there CHF line. You can’t go wrong with Spikes.
3/4 found this helpful
Helpful Positive Review
Spike’s Tactical 16-inch LE M4 Barrel by Pop, Verified Owner, February 3, 2023
Accurate and affordable barrel with no feed issues and will shoot consistently round after round. Also this barrel is heavy enough to be consistent but not too heavy to be carried in the field all day. Choose this Barrel and rest assured that you hav...
Read More...
1/1 found this helpful
Helpful Positive Review
Best Barrel/ Best Price by Eric B, Verified Owner, January 24, 2021
If you build, you know it's hard to find quality for a good price (and something you'd stake your reputation on). This is my go to for all 16" builds. I have never had issues with head-spacing (Using Cryptic, Toolcraft and Spikes bolts). M4 design/ ...
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2/2 found this helpful
Helpful Positive Review
Awesome Barrel by Dude, Verified Owner, December 15, 2020
I use these barrels in most of my builds as they are extremely accurate, well made, have great fitment, and are chrome lined. You cannot go wrong with these barrel and the only other barrels I would suggest would be the Spikes CHF or the DD.
1/1 found this helpful
Helpful Positive Review
Spikes Tactical SB51605-M4 thumbs up by Ohell, Verified Owner, November 13, 2020
Not all my barrels are chrome lined, but when they are Spikes makes a good option without being too pricey. “get some” before they’re gone. Unfortunately I dropped this one during a build while boating. Optics Planet inventory and order fulfillment...
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1/1 found this helpful
Most Recent Reviews
Spike tactical barrel by M.B., Verified Owner, December 17, 2025
Been looking for this barrel everywhere and nobody had it and you guys had it. It’s exactly what I needed to complete my build you guys rock and are awesome good price on it and fast delivery plus earn points, so that’s why I will continue doing busi...
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Read All 7 Reviews
3 Models Available
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made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Spikes Tactical 16in M4 LE- 5.56 Barrel Extension

Install this Spikes Tactical 16in M4 LE- 5.56 Barrel Extension to ensure more precise shots from your firearm. Spikes Tactical manufactured these AR15 Barrels from sturdy MIL-B-11595E CMV steel complete with a Mil-Spec phosphate coating to ensure maximum protection against harmful, corrosive elements. For even further corrosion resistance, the Spikes Tactical 16in M4 LE 1/2 x 28 Thread Pitch 5.56 Barrel is chrome-lined which also creates a much easier cleaning experience. Keep your weapon in pristine condition and performing to its highest capabilities by upgrading to a Spikes Tactical 16in M4 LE 5.56 1/7 Twist Barrel.image

Specifications for Spikes Tactical 16in M4 LE- 5.56 Barrel Extension:

Manufacturer: Spikes Tactical
Color: Black
Caliber: 5.56x45mm NATO
Barrel Length: 16 in
Barrel Twist Rate: 1-7
Gun Model: M4
Condition: New
Firearms Threads Per Inch: 1/2x28
Country of Origin: USA

Features of Spikes Tactical 16in M4 LE- 5.56 Barrel Extension:

  • MIL-B-11595E CMV
  • Chrome Lined
  • 1/7 Twist Rate
  • 1/2 X 28 Thread Pitch for Muzzle
  • 5.56 Nato Chamber
  • M4 Feed Ramped Barrel Extension
  • Mil-Spec Phosphate Coating

Package Contents:

  • Spikes Tactical 16in M4 LE- 5.56 Barrel Extension

What firearm models does the manufacturer say Spikes Tactical 16in M4 LE- 5.56 Barrel Extension is compatible with?

The manufacturer says that Spikes Tactical 16in M4 LE- 5.56 Barrel Extension is compatible with M4

Spikes Tactical 16in M4 LE- 5.56 Barrel Extension Orderable Models

List of Orderable Models

  • Spikes Tactical Barrel 5.56 - 16in Midlength LE, SB51605-ML , MPN: SB51605-ML , UPC: 815648020972 , Code: 2A8-ATB-STM4BRLEXT-SB51605-ML
  • Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block, SB51605-M4G , MPN: SB51605-M4G , UPC: 815648020965 , Code: 2A8-ATB-STM4BRLEXT-SB51605-M4G
  • Spikes Tactical Barrel 5.56 - 16in M4 LE w/ FSP, SB51605-M49 , MPN: SB51605-M49 , UPC: 815648020958 , Code: 2A8-ATB-STM4BRLEXT-SB51605-M49

Spikes Tactical 16in M4 LE- 5.56 Barrel Extension Unavailable & Discontinued Models

List of Unorderable Models

  • USED Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block, SB51605-M4G, EDEMO1, Used, Condition Fair, Missing Item , MPN: SB51605-M4G-EDEMO1 , Code: 2A8-ATB-STM4BRLEXT-SB51605-M4G-EDEMO-MI-D
  • USED Spikes Tactical Barrel 5.56 - 16in Midlength LE, SB51605-ML, EDEMO1, Used, Condition Like New, Inspect and Rebox , MPN: SB51605-ML-EDEMO1 , Code: 2A8-ATB-STM4BRLEXT-SB51605-ML-EDEMO-RE-A
  • Spikes Tactical Barrel 5.56 - 16in M4 LE, SB51605-M4 , MPN: SB51605-M4 , UPC: 815648020941 , Code: 2A8-ATB-STM4BRLEXT-SB51605-M4
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