Diamondback DB Barrel — 9mm Luger, 10", Black Nitride, 4150 Chrome Moly Vanadium Steel | Model 9X1910M50B984NFR (UPC: 815875019237)
Build a soft-shooting, accurate PCC/AR-9 with the Diamondback DB 9mm Luger 10" Barrel. Machined from 4150 Chrome Moly Vanadium (CMV) steel and treated inside and out with a durable black nitride (QPQ) finish, this barrel gives your 9mm build the toughness, corrosion resistance, and easy maintenance it needs for long training days and match use. The 10-inch length hits a practical sweet spot—compact enough for tight quarters and suppressed setups, yet long enough to deliver consistent velocity and a forgiving sight radius for red dots and prisms.
Why Choose This Diamondback 10" 9mm Barrel?
Duty-grade 4150 CMV: Trusted barrel steel that withstands heat and round count better than 4140 alternatives—ideal for high-volume practice and PCC competition.
Black Nitride (QPQ) finish: Hard, slick surface resists rust and reduces fouling build-up, so the bore cleans faster and maintains accuracy longer.
9mm Luger versatility: Train more for less—9mm offers plentiful, affordable ammo with lower recoil and blast than rifle calibers.
AR-9 friendly: Built for AR-pattern 9mm uppers (commonly straight blowback or delayed systems). Pair with quality components and tuning for reliable cycling.
Compact + controllable: 10" length balances maneuverability with useful velocity for steel matches, home range sessions, and suppressed use (where lawful).
Key Features at a Glance
Caliber: 9mm Luger
Barrel Length: 10 inches
Material: 4150 Chrome Moly Vanadium (CMV) steel
Treatment: Black Nitride (QPQ), inside and out
Platform: AR-9 / PCC-style builds (upper/bolt/mag compatibility required)
Model: 9X1910M50B984NFR
UPC: 815875019237
Finish/Color: Matte black nitride
Builder’s note: Verify twist rate, muzzle thread pitch (9mm often uses 1/2x28 or 1/2x36), gas/operating system (most AR-9s are blowback or delayed), feed ramp/extension style, and barrel contour for your specific production run so you can choose the correct bolt, muzzle device/suppressor mount, and handguard.
Performance Benefits You’ll Notice
Cleaner shooting, less scrubbing: QPQ nitride reduces copper/carbon adhesion for easier post-range cleanup.
Long service life: 4150 CMV plus nitride treatment helps resist throat and crown wear under sustained fire.
Manageable recoil impulse: 9mm’s softer push supports faster sight recovery and tighter hit cadence on close targets.
Consistent velocity: The 10" tube provides a solid balance of speed and compactness for common 115–147gr loads—great for tuning subs and supers when running suppressed (where lawful).
Ideal Use Cases
PCC competition (USPSA/IDPA/steel) where reliability and quick handling matter
Training & range carbines with affordable 9mm ammo
Suppressed builds (confirm thread pitch and use an adjustable/delayed system for best results, where lawful)
Home/ranch utility trainers matching your pistol caliber for shared logistics
Build & Compatibility Checklist
Upper receiver: AR-9 pattern compatible with 9mm barrels
Bolt/BCG: 9mm-specific bolt (straight blowback or compatible delayed system) properly headspaced/checked to the barrel
Magazines: Use quality AR-9 mags matched to your lower pattern (Glock-pattern, Colt-style, etc.)
Muzzle device: Match the barrel’s thread pitch; select a 9mm-rated brake/flash hider or suppressor mount (where lawful)
Handguard: Free-float rail that clears your chosen muzzle device/suppressor
Buffer system: For blowback builds, tune buffer weight and spring to your ammo and whether you run suppressed
Installation Tips
Inspect & prep: Degrease barrel extension and receiver; lightly oil mating surfaces.
Torque correctly: Install the barrel nut to spec and confirm straight alignment.
Check bolt fit: Ensure smooth lock-up and proper protrusion/clearance for your 9mm bolt.
Function test: Confirm feed reliability with your chosen mags and ammo; verify last-round hold open (LRBHO) if your lower supports it.
Tune the system: Adjust buffer/spring weight (and gas/port timing in delayed systems) for consistent ejection and minimal bolt bounce—especially with suppressors.
Specifications
(Twist rate, muzzle threading, gas system compatibility, weight, and exact contour can vary by production. Confirm details prior to ordering companion parts.)
Frequently Asked Questions
Q: Will this work with my standard AR-15 5.56 bolt?
A: No. Use a 9mm-specific BCG compatible with your operating system (blowback or delayed).
Q: What thread pitch is the muzzle?
A: 9mm barrels commonly use 1/2x28 or 1/2x36. Verify the exact thread for this production run before purchasing a muzzle device or suppressor mount.
Q: Do I need a special magazine?
A: Yes—use magazines that match your lower receiver pattern (e.g., Glock-pattern or Colt-style AR-9 mags) for reliable feeding.
Q: Is this barrel chrome lined?
A: It features a black nitride (QPQ) treatment rather than chrome lining, offering a hard, corrosion-resistant surface and easy maintenance.
Q: Can I run subsonic ammo and a suppressor?
A: In many builds, yes—verify thread pitch, use a 9mm-rated suppressor (where lawful), and tune buffer/bolt for reliable cycling with subs.
Recommended Pairings
Heavy PCC buffer or tuned recoil system for blowback AR-9s
Enclosed-emitter red dot for duty-grade durability in the rain/dust
9mm-rated muzzle device or suppressor interface (thread-matched)
Free-float M-LOK handguard with light/laser mounting options
Quality mags from reputable brands matched to your lower pattern
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Give your PCC or AR-9 build a durable, easy-to-clean foundation with the Diamondback DB 9mm Luger 10" Black Nitride 4150 CMV Barrel—the compact performer that balances reliability, velocity, and maneuverability for training days, matches, and suppressed configurations (where lawful).
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