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I did achieve 395 FPS in my TM M14..
I changed all internals parts with prometheus one.
The spring use was a MS110.
- Ball bearing spring guide from Prometheus
- 6.03 Tightbore 509mm, Prometheus
- Spring MS110, Prometheus
- Prometheus metal bushing
- Prometheus POM piston head
- Prometheus Cylinder head
- Systema Red piston
Enjoy it's a great AEG.
JF
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