HM Defense MONOBLOC Barrel, Standard, Non-Lined, Cerakote – Various lengths

5.00 out of 5
(1 customer review)



HM Monobloc barrels include an integrally machined & patented gas block.

Chambered in 5.56 NATO/.223 Rem, the 4150 Chromoly Vanadium barrel comes in various lengths.

This barrel features a 1:8 twist & a mid-length gas system.

All HM Defense barrels are match-grade, tripled honed & button rifled for superior accuracy.

HM Defense barrels also feature mil-spec M4 feed ramps, properly installed & head spaced with gauges.


  • Gas block integrally machined as part of barrel
  • Eliminates gas block installation & alignment issues
  • Improved barrel harmonics for better accuracy
  • Dependable performance in severe conditions
  • Low profile; clears barrel nut & allows rail swap, if pinning & welding

Read more about HM Defense’s MonoBloc technology, from the Lead & Steel resource center, here.

Additional information

Barrel Length

9.5" Cerakote Black Exterior – Non-Lined Bore, 12.5" Cerakote Black Exterior – Non-Lined Bore, 16" Cerakote Black Exterior – Non-Lined Bore

1 review for HM Defense MONOBLOC Barrel, Standard, Non-Lined, Cerakote – Various lengths

  1. 5 out of 5

    David Skiles

    Purchased a manganese phosphate coated, chrome lined 12.5” barrel January 2023. The company was AMAZING to deal with!! Shipping and packaging was AWESOME! The barrel itself is pristine! Note that you need to purchase a gas tube and retaining pin in addition to this barrel. This was my first time dealing with the company and they were 100% transparent and communication was above standard with every step! I look forward to more purchases from them in the future.

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