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The Ballistic Advantage 5.5" 9mm Modern Series Barrel is a compact barrel for AR-9 pistol builds, machined from 4150 chrome moly vanadium steel with a QPQ corrosion-resistant finish. Its straight profile and 5.5-inch length suit compact builds, and it operates by blowback, so no gas block or gas tube is required.
The barrel is machined from 4150 chrome moly vanadium steel with a QPQ corrosion-resistant (nitride) finish, including a QPQ-finished M4 feed ramp extension. The feed ramp and barrel extension are integrated with the barrel.
The barrel uses a 1:10 twist rate and 1/2-28 x .400 full-profile muzzle threads. Use 9mm-rated muzzle devices with this barrel: a standard 5.56mm 1/2x28 muzzle device does not have enough bore clearance for a 9mm round.
9mm AR-platform operation is blowback, so this barrel has no gas port and needs no gas block or gas tube. It fits standard mil-spec AR-15 upper receivers. Colt/Rock River style builds need a magwell conversion insert, and Glock-style builds need a dedicated 9mm lower.
| Manufacturer | Ballistic Advantage |
| Model | Modern Series |
| MPN | BABL9MM001M |
| UPC | 819747025975 |
| Caliber | 9mm |
| Length | 5.5" |
| Profile | Straight |
| Twist Rate | 1:10 |
| Gas System | Blowback (none) |
| Thread Pitch | 1/2-28 x .400, full profile |
| Material | 4150 Chrome Moly Vanadium steel |
| Finish | QPQ Corrosion Resistant |
| Weight | 12 oz |
| Color | Black |
Product identification: Ballistic Advantage Modern Series 5.5" 9mm straight barrel, MPN BABL9MM001M, UPC 819747025975. Specifications reflect the supplied product information.
Ballistic Advantage
