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HM Defense

HM Defense AvengerM308 - Monobloc Rifle - Patented Adjustable Gas Block - Monobloc Barrel .308 Win/7.62 NATO

Product Code : AvengerM308


Mfg Item #: AvengerM308

AvengerM308 - Monobloc Rifle - Patented Adjustable Gas Block - Monobloc Barrel  .308 Win/7.62 NATO


PLEASE READ! Current lead time is 30 days. 30 days from the time payment posts in our system.



HM patented Monobloc™ barrel with an integrally machined adjustable gas block. Chambered in .308 Win/7.62 NATO, the 4150 Chromoly barrel is 18 inches in length, with a 1:10 twist ratio and a rifle-length gas system. All HM Defense barrels are match grade; tripled honed and button rifled for superior accuracy.



The custom HM Defense 10 3/8” inch, free float 1913 Picatinny rail is CNC machined from 6061-T6 aircraft grade aluminum. The rail is compatible with Magpul M-LOK mounting system.


Lower receiver:

Custom HM10 billet lower receiver is CNC machined from 7075-16 aluminum and includes unique HM design elements.


Upper Receiver:

Forged 7075-16 upper receiver with forward assist, M4-style feed ramps, and a 1913 Picatinny rail flat top.



AR-10 Bolt Carrier Group


End Plate:

HM Defense rifles feature a custom Quick Disconnect (QD) end plate.



Rifle features a 3.5lb enhanced drop in trigger, black Mil-Spec HM stock, enhanced grip, extended ar-10 charging handle.



10 round .308 Win/7.62 NATO magazine



8lb 15oz



Ceakote Midnight Tunsgten



  • Gas block integrally machined as part of barrel
  • Eliminates gas block installation and alignment
  • Improved barrel harmonics for better accuracy
  • Dependable performance in severe conditions

  • Barrel: Available on DefenderM5, DefenderM5L, RaiderM5 (5.56 NATO/223 Rem) and AR-10 (308 WIN.) models, with a mid-length and rifle gas systems. All HM Defense barrels are match grade, tripled honed and button rifled for superior accuracy. Barrels are manufactured in 4150 Chromoly.
  • Barrel Extension: All HM barrels feature Mil-Spec M4 feed ramps, properly installed and head spaced with gauges.
  • Gas Block: The HM MONOBLOC gas block is machined from the solid barrel blank and is an integral part of the barrel.
  • Barrel Length: HM MONOBLOC barrels are produced in 12.5 and 16 inch length with a threaded muzzle.

Determined at checkout.