Centurion Arms CM4 Forged Receiver Set

Description

UPPER RECEIVER DETAILS:

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

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