HM Defense Monobloc® barrels with the gas block milled into the barrel blank, built into complete uppers by the Second of Ten team. Pick a barrel length, then choose your configuration: each upper has its own page with photos, a zoom viewer, full specifications and price. Every upper ships complete with the SOT Enhanced HMB™ bolt carrier group and a Breek Arms WARHAMMER Mod2 ambidextrous charging handle.
Monobloc® and HMB™ are marks of HM Defense, LLC, used under license. WARHAMMER is a mark of Breek Arms. Cerakote® is a mark of NIC Industries.
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Tell us what you need and we will help you choose the right configuration.
Shipping restrictions. We do not ship AR-15 upper receivers, conversion kits or barrel assemblies to CA, CT, DE, DC, HI, IL, MD, MA, NJ, NY, RI or WA, or to certain localities including Denver, CO and Cook County, IL. Exception: Monobloc uppers are marked and marketed as HBAR and can ship to Maryland. Questions? Consult your local FFL.
Bombproof by Design™
Precision // Purpose // Performance