They come with 7mm bearing bushings for the bevel and spur gear, and on the sector gear there are 8mm bearings bushings, which is a nice touch. On the standard G&G M14s there is a spring guide with a metal base and tabs that has a plastic shaft, it also has a think plastic washer which acts as a faux bearing. However the G&G M14 Veteran/Evolution there is a full metal bearing spring guide.