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Originally Posted by spleen
We've never really used M130s or M150s, but the velocity for the M120 actually seems a bit low. We usually see 400-420 for an M120!
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Oddly enough my M120 shoots a consistent 380+/-
Based on the ASC Spring guide chart:
http://www.airsoftcanada.com/SpringChart.html the M120 is around 392fps with a tight bore, etc etc.
Now, it did say that this new mechbox has an enclosed all-in-one hop up, so it seems they made sure the seal was really tight so there's little loss of air, similar to the upgrades done for the spring chart test.
Also my M120 isn't connected to a tight bore, so that can explain the 10fps difference.
Sure you're not thinking of the M120S which is around 400-420fps?