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I have a g&g m4 cqd and I am actually impressed with the internals on it. I've run many thousand rounds through it and all I had break was a piston head. Replaced that with a poly one from airsoft parts and was back up and running. With the stock spring and all stock internals (less new piston head) with .20's it shoots a little over 400. Has bearing spring guide and bearing piston head spring guide too. Ball bearings on all the gears shafts too. I'm gonna keep it as is until things break but so far so good.
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