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It's probably not the spring but the compression parts.
Make sure you don't use this gun until you have solved the issue, because certain types of compression failures can cause piston stripping (especially ones where you shoot a really low fps and then sometimes two BBs come out at the same time, etc).
Who did the downgrade for you? If it was a retailer that sells G&Ps, take your gun back and insist that they get the compression stable and chrono'ing across a whole mag before they give it back to you.
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"Mah check"
Now you know
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