Diamond Back 4.5" 9mm Medium Profile BARREL + 9mm True Slick Side Upper Receiver ComboThis 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 true slick side configuration. The ejection port door is sized for 9mm and 22LR. This upper does not have a shell deflector, nor does it have a forward assist.
- 4.5” barrel chambered in 9mm
- Machined from 4150 CMV steel
- Salt Bath Nitride finish
- 1:10 twist rate
- Threaded 5/8x24
- 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