8 mm steel bearing bushings with open bearing specially produced to withstand extreme stresses (B8CA +).

The adoption of these bushings decreases the friction due to the rotation of the gears.
This advantage results in both a higher burst speed and a better use of the energy contained in the battery.
The open bearing guarantees higher strength than the closed one as the balls that compose it are larger.
Another advantage of these bushings is the lower thickness which does not interfere with the selector plate and body of the rifles.

The dimensions are:

- External diameter: 8 mm
- Internal hole: 3 mm
- Thickness: 2.5 mm