Yup. You will have to lower it to 400 fps on .2g. To check if your delta ring is loose, take the handguards off and look at the delta ring itself for any looseness.
EDIT:
.2g is for measurement purpose only. As an example, 330fps on .2g will deliver a 1joule power.
if you are using .25g, then to equal the 1joule power will you have to shoot a maximum of 300fps, approximately.
In the end, it is not the FPS that counts, but the energy delivered on the impact.
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