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The Brownells Retro A1 rifle length barrel replicates exactly the exterior contours of the original "skinny" barrel of the M16A1 rifle, so it's ideal for building your own Retro Rifle™ OR any AR-15 where a lightweight barrel is desirable. Chambered in 5.56x45, this chrome-lined barrel has a 1-12" twist and is finished in matte black phosphate, with an overall length of 20". The muzzle threads are ½"-28 tpi, and in the back a standard rifle barrel extension is pre-installed.

  • 5.56 NATO chamber (also accepts .223 Rem)
  • Original 1-12" rifling compatible with heavier bullets
  • Chrome-lined bore
  • Requires a rifle-length gas tube (available separately)
  • Available as Stripped or complete Barrel Assembly


This Brownells Retro A1 rifle barrel is machined from ultra-strong 4150 chrome-moly steel, and is magnetic particle inspected when finished to ensure there are no hidden flaws that could shorten its service life.


Big Book Catalog, Issue:70, Page:016
Big Book Catalog, Issue:71, Page:018
Big Book Catalog, Issue:72, Page:012
Big Book Catalog, Issue:73, Page:013
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  • BROWNELLS MILITARY BARRELS - AR-15 20" A1 RIFLE BARREL 1-12 ASSEMBLY

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    Cartridge: 5.56 mm NATO

    Length: 20"

    Finish: Black

    Gas System Length: Rifle

    Muzzle Threads: 1/2-28

    Twist: 1-12

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