P90 Hop Chamber? Other upgrades advice?

Lollingsgrad

AF-UK patch owner
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I bought a cheap CYMA P90 to try my hand at teching without fear of destroying a several hundred pound AEG. I was going to start with a flat hop since it looks easy but I've heard that the hop chamber on the CYMA is kinda garbage. Does anyone have experience with the CNC'd chamber that appears under a bunch of brands shipping from Hong Kong?

https://m.ebay.co.uk/itm/ProWin-CNC-Hop-Up-Chamber-for-Marui-90-G-P-AEG/141977906867?epid=812060932&hash=item210e8aeeb3:g:xagAAOSw3mpXJczP

I was also considering going tight bore so I can go down to a lighter spring and allow it to shoot at a higher rate without going to a massive battery that'll fry the reportedly dodgy trigger contacts. Does this make sense or am I confused? First time teching so I could be talking nonsense.

 
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