The HM Defense Defender M5 in 5.56x45mm NATO (MPN HM15FMB556) is a semi-automatic AR-15 built around an HM MonoBloc 4150 chromoly, match-grade 16-inch barrel with a 1:8 twist rate, triple honed and button rifled with an integral machined gas block. HM Defense fits a 10.37-inch free-float handguard with a Picatinny rail, compatible with Magpul M-Lok accessories, and finishes the receiver in black hard-coat anodizing. The rifle wears a Mil-Spec HM stock and an enhanced polymer grip, feeds from a detachable magazine with a 30+1 capacity, and uses a manual thumb safety. It ships optic-ready with no fixed sights. Among AR-platform rifles in the AR rifles category, the Defender M5 favors shooters who want a match-grade barrel in a full-featured AR-15.

Key Specifications

• Chambered in .223 Rem/5.56 NATO with a 1:8-inch twist rate.
• Features an HM MonoBloc 4150 chromoly, match-grade 16-inch barrel.
• Barrel is triple honed and button rifled with an integral machined gas block.
• Includes a 10.37-inch free-float handguard with a Picatinny rail.
• Finished in black hard-coat anodizing.
• Wears a Mil-Spec HM stock and enhanced polymer grip.
• Feeds from a detachable magazine with a 30+1 capacity.
• Uses a manual thumb safety.
• Ships optic-ready, with no fixed sights.

Frequently Asked Questions

What barrel does this rifle use? An HM MonoBloc 4150 chromoly, match-grade barrel, triple honed and button rifled.

Does this rifle come with sights? No, it ships optic-ready with a Picatinny rail on the handguard.

Buy the HM Defense Defender M5

A match-grade barrel in a full-featured AR-15 is exactly what the Defender M5 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.