I have been doing a lot of research for a new HPA tank in this forum. Many people have recommended an adjustable tank so that you can go above the normal 800-850psi a preset has in order to increase trigger response. I understand that the mag will work without psi over 800, but any performance increase is $money$ as far as im concerned. I have found two tanks One is a Nitroduck ireg which comes with adjustable pistons (400, 600, 800, 1000) which allow psi aove 800, but it isnt adjustable past those four piston settings. The other is the Nitroduck x-stream hpa tank. It is fully adjustable from 200-900psi. I was wondering if it is better to get the fully adjustable one and take a hit on the psi boost, or go with the ireg with the preset pistons and get the extra power. There is also an $80 difference between the ireg-$169 and the x-stream-$249. So whats the call?????? 
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