Needle Bearing - Rocker Body SCE or J 108

The Needle Bearing - Rocker Body SCE or J 108 (MPN 0416) is a precision roller bearing assembly designed for demanding firearms actions and tactical equipment that require smooth, reliable cycling under extreme conditions. This component is essential in firearm bolt carrier groups, reciprocating charging handles, and high-cycling-rate mechanisms where traditional ball bearings may wear out prematurely.

Constructed from precision-machined steel, this rocker body design minimizes friction and wear on adjacent components, thereby extending the overall action life during sustained-fire scenarios. The needle bearing distributes radial loads over a larger contact surface than conventional ball bearings, allowing it to effectively absorb shock loads typical in recoil cycling. This ensures consistent performance across temperature extremes and high round counts.

Armorers, gunsmiths, and military small-arms maintenance personnel rely on this bearing for bolt carrier group overhauls, carrier tilt corrections, and action smoothing on rifles and carbines. The SCE or J 108 designation indicates its compatibility with various platforms, making it a reliable choice for shooters looking for replacements without uncertainty.