You can find the Ballistic Advantage Modern 18" 5.56 1:7 SPR Rifle Gas System Barrel here.
Ballistic Advantage Modern Series 18" 1:7 twist Barrel with a Rifle Length gas system, SPR barrel profile and chambered for 5.56 NATO.
Ballistic Advantage Modern Series barrels are machined from 4150 Chrome Moly Vanadium Steel and finished with a corrosion resistant QPQ Salt Bath Nitride treatment. The M4 feed ramp extension also has a QPQ finish.
| Caliber | 5.56 NATO |
| Barrel Length | 18" |
| Twist Rate | 1:7 |
| Gas System | Rifle Length |
| Barrel Profile | SPR |
| Inside Finish | Salt Bath Nitride |
| Outside Finish | Salt Bath Nitride |
| Material | 4150 Chrome Moly Vanadium |
| Muzzle Thread | 1/2x28 TPI (Threads Per Inch) |
| Diameter At Gas Port | .750" |
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