Barrel Extenders - 3.5 & 4.5 inch length (5.56 / .223 )

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Barrel Extenders to increase your barrel length as long as you need. Comes in 3 and 4 inches sections. (See actual dimensions below)

Modern M4 barrel diameter.

These are very high quality extenders with tight tolerances.. which means they can also be used for your Form 1 Suppressor design.

Can be permanently pinned, welded, or just screwed on tightly. Finish options are black or shiny unfinished steel.

Standard 5.56/.223 1/2 x 28 male/female threads on both ends.



  • Overall length of 3.5 or 4.5 inch
  • Diameter: .70
  • Threads: 1/2 x 28
  • Steel construction
  • Available in Black or unfinished (shiny)
  • 3.5" is 3.9 oz
  • 4.5" is 5.5 oz
  • Steel, Made in USA


* Note: Actual Extender length is different from overall length added to barrel. This is due to the overlapping threads, which means the actual length added to barrel will be a little more than 1/2 inch less than actual size.


** These Barrel Extenders can also be used as the basis for an integral Suppressor of your own design. Can be drilled / modified per your needs.


  • 5
    Very good.

    Posted by Tom fColeman on 26th Mar 2021

    Will be buying more. Thankyou.