VFC MP5A5 V2 HPA conversion

[Twinadad]

This is not going to be your regular tapped green gas mag. This is a Co2 magazine which is capable of 800psi which I would like to simulate the kick and feel but without the costs and all the other variables that go with using Co2. 
 

so here is the beginning of what I hope is going to be a successful first. ?? 
this is my v2 magazine with a dummy Co2 cartridge with both bottom and side port 

however I’m being advised that because of the hard blowback it’s not good for HPA as it will use a tone of air which is completely understandable but it’s got to be cheaper the Co2 using the same amount… right?

so I’m looking at the first strike hero with reg 124ci however is this over kill? I would love to use a smaller tank but don’t fancy running out mid game. They recommended that this tank will get 1875 shots per fill! A good marker for paintball runs high pressure most needing high to operate effectively. So when they say you get xamount of shots per fill is this with low pressure or high pressure as I want 850psi or maybe higher as I want to get a 150% recoil spring so yes it will reduce power but kick harder. 
 

before you plastic internals pipe up she is solid steel. Granted I might get through some buffer pads ? but it’s worth it

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[Guest]

How will you regulate it?
I’m particularly interested  in how you’ll get down to site limits from 800ish psi.

Not trolling, genuinely interested 

 

[Twinadad]

How will you regulate it?
I’m particularly interested  in how you’ll get down to site limits from 800ish psi.

Not trolling, genuinely interested 

no worries dude I didn’t think you was trolling. If you don’t ask you can’t know ??
 

Well it’s Co2 anyway which equals 800psi

however…. I believe they sell nozzle valves for different variations. Ie CQB, milsim, skirmishes so I’m hoping to reduce the pressure going out the barrel and deflect it into the recoil. That bit I’m not so sure on. I’ve read changing recoil spring can either increase fps but decrease recoil, and increase recoil reducing fps. 
so hopefully will get it to 350fps but with a stronger kick ????‍
 

I have a question how much do you know about HPA? Would like to pick your brain seen as your trolling ?????

ps in pictures the red nozzle are different 

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