Plastic bushings would do just fine under the following conditions:
- they are adequately lubed
- your gun runs at less than 330~340FPS
- the spring in use is not the hard & short type
- you do not push the gun with high power battery (a GP 3300 8.4V or a Sanyo 1300 9.6V may be too much)
- you often keep your gun under proper usage
Even without upgrade, you should in any case replace the stock plastic bushings after around 13000~15000 shots.
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