Just upgraded my G&G AK-104 with a PDI 150% spring and it works fine and is shooting at around 380 fps. For some reason the Prometheus MS110 spring 'didn't work' as the motor failed to spin, so we tested out by installing a PDI 150% spring and is working fine. I have a good idea what the problem is...but that is another story.
Yes the Prometheus springs are really good...have one MS110 for my TM AK and one MS100 installed for my Sig552.
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