Centurion CM4 Forged Upper Receiver

Description

Centurion forged upper receivers are a great complement to their forged lower receivers and are batched either with a MIL-Spec or Thermal Fit bore.

MIL-Spec inner dimension measures at 1.000 -0.0/+0.002″

The thermal fit inner dimension measures at .997 -0.0/+0.001″ and requires the application of heat in order to provide a solid mate to the recommended barrel extension. By heat we mean more than Granny’s hair dryer.

• For Use with M4 Barrel extensions
• Assembled Upper Receivers come with ejection port cover and forward assist installed
• Made in America on American-made machines