DB 4.5" 9mm Barrel + 9mm Slick Side Upper Receiver Combo

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Product Code: 9x19_4.5M50B9.84NFR-PCC-3
Stock Status Stock Status: Out of Stock
MSRP: $220.00
Sale Price: Sale Price: $101.95
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Out of stock

Diamond Back 4.5" 9mm Medium Profile BARREL + 9mm Slick Side Upper Receiver Combo

This combo kit comes with a 4.5" 9mm DiamondBack Barrel and a SlickSide 9mm (.22LR compatible) upper receiver. The Diamondback Firearms 9mm Barrel is machined in house on state-of-the-art CNC machines and are thoroughly inspected at multiple stages of the build process to ensure quality. This 4.5” barrel is machined from 4150 Chrome Moly Vanadium Steel and has a 1:10 twist rate. It is threaded 5/8x24. The final process is a salt bath Nitride finish for an added layer of protection.The RTB Upper is made from forged 7075-T6 aluminum and is Hard Coat Anodized. It meets military specifications and comes in a slick side configuration. The ejection port door is sized for 9mm and 22LR. This upper does have a shell deflector, but does not have a forward assist.


Caliber 9mm
Length 4.5
Material 4150 Chrome Moly Vanadium
Profile Straight
Finish QPQ Corrosion Resistant
Gas System Length None
Gas Block Journal N/A
Dimpled? No
Twist Rate 1:10
Muzzle Thread 1/2x36 TPI
Weight 8.3oz
Barrel Extension Integrated
Target Crown 11 Degree



  • Machined from a Mil-Spec 7075 T6 forging
  • Type III Hardcoat Anodized finish

These uppers are machined to extremely tight tolerances for a more accurate build. Seating the barrel may take additional force. Light taps with a rubber mallet will do the trick.

Please Note: These uppers are only compatible with .22LR and smaller pistol caliber rounds, such as 9mm and .40