The HM Monobloc barrel includes an integrally machined patented gas block. Chambered in 5.56 NATO/223 Rem, the 4150 Chromoly barrel is 12.5″ in length. This barrel features a 1:8 twist ratio and a mid-length gas system. Manganese phosphate coating exterior, chrome lined bore for maximum service life EXCLUSIVE to L&S! All HM Defense barrels are a match grade, tripled honed and button rifled for superior accuracy. All HM Defense barrels feature Mil-spec M4 feed ramps, properly installed and head spaced with gauges.
- 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
- Weighs 26oz with a 0.082″ gas port diameter
Optional CHROME LINED coating EXCLUSIVE to L&S
Guys, these barrels are unreal. Traditional barrels are turned and relatively easy to manufacture. These require special CNCs; they start from a 4150 blank and machine down until a barrel + gas block is formed. No more gas loss/leak, dimpling, screwing, pinning, thermal shift, etc. This is the most bombproof gas block setup in the industry. And because there’s no gas loss, HM can get away with a more conservative port size.
These barrels have low recoil and take very well to a suppressor. Medium contour, and best of all, world-class sub minute of angle accuracy. These things can really group. You won’t be disappointed.