Quote:
Originally Posted by moz_boz
I have the King Arms P90. I am looking for a replacement/upgrade hop-up. Does anyone know if there are any compatibility issues between KA - TM - CA - E1?
Also, anyone know where to get trigger contacts for them? Don't need them yet, but planning ahead 
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Shouldn't be any issues with KA to TM and Echo1 compatibility wise. The KA and Echo1 are both based off of the TM unit. I have heard some issues with CA's that can easily be solved with some sanding and filing.
Final verdict would be get TM or CA, avoid the Echo1 and All-Win units, I have had/heard bad experiences with both units.
Trigger contacts you can order CA ones from Airsoft Global I believe (Got mine from there). Those are probably the best P90 trigger contacts you can get on the market imo.