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Systema M100 Irregular-Pitch Airsoft AEG Power-Up Spring (340~380 FPS)
[SPR-STMA-M100]
$11.00
by Leif E. Date Added: Wednesday 26 October, 2011
Great spring if you want to downgrade for an Indoor CQB setup or if you are converting to a high speed setup.

I've got this in my MP5 (with too many mods to list) and it chrono'd at 330 fps. If you combine this spring with a high speed motor (I've got the G&P M120 HS motor) you can expect a ROF from 20 to 50 bbs/sec depending upon your gearset and other internal components.

Great value upgrade!

Rating: 5 of 5 Stars! [5 of 5 Stars!]
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