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The CMC Triggers BBL556001 is purpose-built for AR pistol and short-barrel rifle builds that demand quality without compromise. Machined from 4150 Chrome Moly Vanadium steel, this 7.5-inch barrel gets its durability and corrosion resistance from an H&M Blacknitride+ coating that also improves fatigue strength and lubricity.
Button rifling creates tight, uniform bore geometry throughout the length of the barrel. The 1:7 twist rate effectively stabilizes the wider range of 5.56 projectiles, from standard 55-grain rounds up through heavier 69 to 77-grain loads commonly used in modern builds. Land and groove tolerances are held to .0001 inch variation from breech to muzzle, yielding the concentricity that serious builds demand.
Every barrel gets precision-inspected for absolute straightness and air-gauged for maximum uniformity. The CMC Triggers design includes an M4 feed ramp for reliability, an 11-degree match crown for accuracy, and a bottom dimple that makes gas block installation and alignment straightforward. Threading is 1/2-28 to accept standard AR muzzle devices and suppressors.
This barrel was engineered with real-world input from military, law enforcement, and civilian builders in mind. The SOCOM profile strikes a balance—it's lighter than heavy barrels but substantial enough to handle the thermal stress and cycling demands of short-barrel systems. At roughly one pound, it won't make your pistol build uncontrollably front-heavy, yet it delivers the thermal mass to support consistent function.
The 1:7 twist stabilizes a wide range of 5.56 projectiles effectively. It performs particularly well with heavier loads in the 69 to 77-grain range, and also cycles lighter 55-grain ammunition reliably. This twist rate matches military standard practice and provides excellent versatility for modern ammunition choices.
Yes, this 7.5-inch barrel is purpose-designed for AR pistol and short-barrel rifle platforms. The SOCOM profile, pistol-length gas system, and thermal mass balance short-barrel reliability with manageable weight. The bottom dimple and standard M4 feed ramp simplify installation on compact builds.
Button rifling creates consistent bore geometry and tight tolerances from breech to muzzle, which translates to reliable accuracy and straightness. CMC's button-rifled barrels are air-gauged and precision-inspected to ensure land and groove uniformity to within .0001 inch, supporting the precision your build deserves.
This proprietary coating improves wear resistance, corrosion resistance, and fatigue strength compared to standard finishes. It also enhances lubricity for smoother operation and offers superior cosmetic appeal. For barrels that see real use, this finish helps extend barrel life and maintain reliability.
| UPC | 850040016925 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BBL556001 |
| Length | 7.50" |
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