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1. Get a new nozzle, stock A&K nozzle has no o-ring and is prone to cracking. I suggest Wii-tech. It's metal, and the compression achieved from that is far superior to the stock nozzle.
2. Might as well get a new hop-up as well, go full metal I also recommend Wii-tech for this.
*I believe they sell a package that incorporates both these parts*
3. Test your piston head compression with the new nozzle.
4. Re-shim if you're dropping in a new motor.
Test and see.
Possibly upgrade the piston if it's stock, it's a cheaper plastic piston that will crack.
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