Our forged upper receivers are a great complement to our forged lower receivers and are batched with a Thermal Fit bore.
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
*** We recommend gunsmith installation for all of our parts. We cannot warranty items damaged by improper installation.
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