HM Defense Defender M5 HM15FMB556 5.56 NATO 16-inch Barrel

HM Defense’s HM15FMB556 Defender M5 is an AR-style semi-automatic rifle chambered in .223 REM/5.56 NATO with a 16-inch match-grade barrel. The rifle uses a HM MonoBloc 4150 chrome moly barrel with an integral machined gas block and is button rifled and triple-honed for consistency. A 10.37-inch free-float handguard with a Picatinny rail and Magpul M-Lok compatibility, Mil-Spec HM stock, and enhanced polymer grip complete the package for reliable handling and setup flexibility.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel measures 16 inches and is described as 4150 Chrome Moly Match Grade.
• The rifling twist rate is 1:8″.
• The handguard is a 10.37-inch free-float with Picatinny rail and Magpul M-Lok compatibility.
• The capacity is 30+1.
• The action is Semi-Auto.
• The receiver material is 7075-T6 Aluminum.
• The finish is Black Hardcoat Anodized.
• The stock is a Mil-Spec HM and the grip is an enhanced polymer design.
• The rifle ships optic ready and includes a manual thumb safety and a muzzle brake.

Built around match-grade components and durable materials, the Defender M5 offers a balanced mix of accuracy, modularity, and modern ergonomics for training, competition, or general-purpose field use. Its free-float handguard, match barrel, and familiar controls make it a practical choice for informed shooters seeking a straightforward, well-engineered AR platform.