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Lead & Steel Nitride MonoBloc URG-E – 12.5″ 5.56




Upper Receiver Group, Enhanced:

Weighing in at <2.8 lbs., the URG-E offers one of the most durable upper receiver assemblies in the industry. This is not a simple commercial offering; these uppers are made for high-volume shooters who expect consistency & reliability with every shot.

Simply drop-in your favorite 5.56 BCG & charging handle, or add a DLC enhanced BCG for further peace of mind, & get to shooting!

Barrel Features:

The patented 1:8 twist 5.56x45mm 12.5″ Midlength Nitride HM Defense MonoBloc barrel provides many advantages over the traditional gas block system. With the gas block integrally machined as part of the barrel, common AR-15 gas system headaches are practically eliminated:

  • NO MORE gas block leaks.
  • NO MORE gas block misalignment.
  • NO MORE set screws, loctite, pinning, etc.
  • NO MORE varied thermal expansion coefficients.
  • NO MORE impingement of M-LOK accessories against the gas block at the 6 o’clock position of the rail.
  • NO MORE marrying a rail to a pinned & welded barrel – the barrel nut freely glides over the block, giving you the ability to swap rails with a P&W muzzle device.

The MonoBloc barrel solves nearly every gas system issue in the industry & offers absolute peace of mind. Paired with our salt bath nitriding and match crown, the MonoBloc barrel offers exceptional barrel life & corrosion resistance.

Buffer disclaimer: We recommend the use of a standard carbine spring & H buffer if shooting unsuppressed.

Rail Features:

  • 6061 Aluminum Free-Float Rail
  • 7075 Aluminum Barrel Nut
  • Patented 17-4PH Cored Stainless Steel Rail mounting attachment
  • Anti-rotate tabs
  • Does not contact or apply side loads to gas tube
  • 1.315″ Inner Diameter of handguard
  • MLOK Slots on all flat sides (7)
  • 10.7 oz. total weight, including mounting hardware

Read more about MonoBloc technology from the Lead & Steel resource center, here.


Aluminum anodizing might as well be wizardry. Color options will always have some variance in shade & hue. Please understand that Lead & Steel makes no guarantees on the exact shade/hue of brown or black that you purchase.

These uppers are manufactured as duty grade equipment. You may find cosmetic evidence of testing & QC upon delivery. This is completely normal & allows us to only deliver upper receivers that pass our strict quality control.

Additional information

Rail Color

Flat Dark Earth (See Anodizing Disclaimer), Black


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