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11mm?!?! I've never even heard of that (except for AEG springs, they are 11mm ID), only 7mm and 9mm.
Get a Laylax PSS10 150SP spring (9mm ID), the first year I had it in my M24, with my bearing guide and tightbore, was getting 515fps out of it, and it's since settled down (and I'm talking MANY thousands of shots) I'm sitting around 490fps.
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