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Airsoft Technical Tips: AEG Springs |
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Written by Fox
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 Springs
There are a
lot of airsoft springs that are available in the market today. They are often
coded or named with numbers that often leave buyers confused… Not to mention a
each manufacturer have a different code for a spring for a given rating. Anyway
here is a guide to help buyers to choose which spring to buy and an expected
FPS output after the spring has settled (usually after a hundred cycles an
airsoft spring settles and maintains a certain fps output till it eventually
wears out)
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Stage
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Spring
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Approx. FPS with settled spring using .20g BB
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Remarks
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Stock Gun
(brand new gun)
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stock
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270-290 FPS
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Approx. FPS may vary with
manufacturer or brand
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Stage1
Upgrade
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M100 / SP100 / PDI120%
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330-350 FPS
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Stage2
Upgrade
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M120 / SP120 / PDI170%
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390-410 FPS
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Still stable with .20 g BB
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Stage3-Upgrade
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M130 / SP130 / PDI190% / PDI210%
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440-460 FPS
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Still ok with .20g BB but is more
stable with .23g BB
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Stage4-Upgrade
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M140 / SP140 / PDI240%
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470-490 FPS
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Ok with .23g BB but more stable
using .25g BB
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Stage5-Upgrade
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M150 / SP150 / PDI270%
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510-530FPS
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Acceptable with .25g BB but more
accurate with .28g BB
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Stage6-Upgrade
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M160 / SP160
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550-580 FPS
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.30g-.36g BB are recommended for
better accuracy
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Stage7-Upgrade
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M170 / SP170
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580-600+ FPS
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.36-.4g BB are recommended
for better accuracy
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Note:
Accuracy
troubleshooting in terms of BB weight
BB hits
everything but the target
Cause:BB
too light for the FPS rating
BB drop
without reaching expected range
Cause:BB too heavy for your guns power rating
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