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G&G made a similar thing for some of their CM16's to centre the hopup. I liked the idea but did not find any accuracy advantage. Though, just because I did not see any improvement on accuracy, does not mean it is not there.
What I find to me most important is that the hopup has to be pushed hard into the GB. This means no movement resulting in a more stable fps. (a lot of hopups can move back and forwards a little) Sometimes I replace the spring at the front of the hopup with a harder one or I shim the hopup backwards towards the GB. The very edge of the hopup should fit into the round hole on the GB making the hopup centred.
 
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