10.3 MK18 (Crane Spec)
Our 10.3" Crane Spec complete upper receiver features the ideal gas port sizing (.070) to achieve minimal gas blowback when ran suppressed. This unit is specifically designed to be ran in conjunction with a silencer.
We do not guarantee reliable cycling with some manufactures ammunition without the addition of a silencer.
- 4150 CMV Melonite
- .070 Gas Port Size
- QPQ Corrosion Resistant Finish
- QPQ M4 Feed Ramps Extension
- Carbine Gas
- 1/7 Twist
- 1/2x28 Muzzle Thread
NOTE * This barrel may not cycle 100% when operated without a suppressor and running cheaper 223REM ammuntion