Dog Bone Mil-Spec M4 / AR15 upper receiver with hardware - Military Clone Correct Engraved T-marks

The "Dog Bone" mil-spec M4/AR-15 upper receiver with T-engraved top rail and installed hardware — a Demco Group-built upper forged from either Mueller or Anchor Harvey forgings, configured with M4 feed ramps and clone-correct T-marks for military-pattern builds.

• Clone-correct T-engraved top rail for M4A1 and M16-pattern builds
• M4 feed ramps, "M4" marked above the gas port — correct for 14.5" and shorter carbine builds
• Forged 7075-T6 aluminum, hard-coat black anodized
• Hardware installed: forward assist and port door
• Forging source — Mueller or Anchor Harvey, collectors prefer Mueller

What the "Dog Bone" upper is

The Dog Bone nickname comes from the distinctive shape of the upper's forge marks. These uppers have been seen in the field on a range of M4 and M16-style rifles, which is why the clone-correct community seeks them out — particularly for builds that mate against Colt, FN, or LMT lowers where the upper provenance matters.

Demco Group in Florida mills these from either Mueller or Anchor Harvey forgings. Both forgings yield a finished upper to the same mil-spec dimensional envelope; the functional difference is essentially zero. Collectors tend to chase the Mueller forgings for bragging rights, but for a shooting build, either is correct. You get your pick from what is in stock.

Finish is honest mil-spec hard-coat — expect light handling marks and the slightly matte, chalky look that characterizes military uppers built for function over cosmetic show. These are built for performance on a carbine.

Specifications

• Platform: Mil-spec M4/M16 upper
• Material: 7075-T6 aluminum forging (Mueller or Anchor Harvey)
• Finish: Type 3 hard-coat black anodize
• Feed ramps: M4 (M4-marked above gas port)
• Top rail: T-engraved, black
• Hardware installed: Forward assist, port door
• Takedown pin holes: Standard 0.25"
• Milling: Demco Group, FL

Charlie's also offers a similar upper without T-marks if the build calls for a plain top rail.

The T-marked Dog Bone upper is the clean foundation for a mil-pattern M4A1 or M16A4 clone. Grab one and build it right.