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11.5″ Barrel 5.56 mm

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The 11.5″ 5.56 barrel — Government profile

This item is currently available for backorder only. We will ship ASAP.

4150 Chrome Molly Vanadium 5.56 mm, button broached barrel. The barrel is threaded with a 1/2×28 thread pitch, a 1-9 RH twist rate with 6 lands and grooves and an M4 feed ramp. This barrel takes a .750 gas block.

Available on backorder


The 11.5″ 5.56 barrel — Government profile

  • Available in 11.5″
  • 5.56 mm
  • 4150 Chrome Molly Vanadium
  • Threaded Barrel — Thread Pitch 1/2 x 28
  • Gas Block Diameter .750
  • Gas Tube Length — Carbine
  • 1-9 RH Barrel Twist
  • 6 Lands and Groves
  • M4 Feed Ramp
  • Government profile
  • Button Broached
  • Weight 1 lb 6 oz

*All NFA regulations apply, Class 3 License required.

SKU: BL-11


.556 mm

Overall Length




Lands and Grooves




Thread Pitch

1/2 x 28


4150 Chrome Mmolly Vanadium




Weight lbs

1.06 lb

Gas Block Required

.750 Diameter

Gas Tube Required

Carbine Length

For best results we recommend following a break-in procedure. We recommend that you clean the chamber and bore after every round for the first 25 rounds. It should take approximately 200 rounds for optimum barrel accuracy. Please keep in mind that accuracy is dependent upon many factors such as bullet weight, powder load, etc. If you have any question regarding our procedure, please ask or give us a call.
Per ammunition guidelines it is not recommended to shoot 5.56mm in a .223 REM  barrel, which we support for best and safest use of our product.