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Hello Everyone,

I have some time ago upgraded my G-Spec with the following parts:

Action Army VSR 10 G-Spec (300mm) 6.03 Precision Barrel
Action Army VSR Rifle Replacement Hop Unit - CNC Aluminium
Action Army Sniper Barrel Spacers
Action Army M150 upgrade spring TM VSR series rifles
Maple Leaf Omage Nub / Tensioner (Airsoft)
Maple Leaf - Monster Hop Rubbers GBB / VSR / WE / TM - 50 60 70 75 80 Degree [70]
AirsoftPro CNC Zero Trigger Kit For VSR Version 4 5377

However i am struggling to get high FPS with this set up. My current numbers are:

426fps with 0.2g
392fps with 0.25g
363fps with 0.36g

I am mainly using 0.36g as they look to give best performance, but the fps with 0.2 looks really bad.

Can someone please advise on what might be wrong with this set up and what could i improve to get closer to 500fps with 0.2...

I cant get good seal either, if i put my finger against the end of the barrel, the air gets out through somewhere else.

Any advise would be appreciated.
Hello Everyone,

I have some time ago upgraded my G-Spec with the following parts:

Action Army VSR 10 G-Spec (300mm) 6.03 Precision Barrel
Action Army VSR Rifle Replacement Hop Unit - CNC Aluminium
Action Army Sniper Barrel Spacers
Action Army M150 upgrade spring TM VSR series rifles
Maple Leaf Omage Nub / Tensioner (Airsoft)
Maple Leaf - Monster Hop Rubbers GBB / VSR / WE / TM - 50 60 70 75 80 Degree [70]
AirsoftPro CNC Zero Trigger Kit For VSR Version 4 5377

However i am struggling to get high FPS with this set up. My current numbers are:

426fps with 0.2g
392fps with 0.25g
363fps with 0.36g

I am mainly using 0.36g as they look to give best performance, but the fps with 0.2 looks really bad.

Can someone please advise on what might be wrong with this set up and what could i improve to get closer to 500fps with 0.2...

I cant get good seal either, if i put my finger against the end of the barrel, the air gets out through somewhere else.

Any advise would be appreciated.
Im not an expert by any means …. But my guess is your Action Army VSR Rifle Replacement Hop Unit - CNC Aluminium…. I have not built one for the vsr10 , i have the gold spec vsr10 but have not modded the hop up unit ….. how ever i have modded many others , and one thing that came to mind while reading this , action army came out with thier own upgrade hop up unit for the AAP-01 assassin pistol , i know apples to oranges … but i do see some similarity’s and i would be willing to bet you have an O ring failure in the hop up unit ( again i havent handled or dismanteld the exact part , just simular product ,) unsure if this is the case , but i would check there …
Also if you wish to increase your fps further what have you done with the cylinder .?? I can make the stock cylinder jump a fair bit with a fit of light sanding to allow more air to enter the nozel ahead of the piston head , when you take the bolt appart to get to the spring the original piston is a white plastic , you can see there are some holes drilled in the sides for some kind of air brake im guessing … i havent messed with those , but as you travel to the front of the plastic piston you will see the padded head with the white rod sticking out of it , gas doesnt flow threw this tip , its solid Gas flows around it as the chamber gets smaller , if you take that white rod , along with some really fine grit 320 grit , sand paper and you polish that down abit , get rid of the weld lines from the mold , dont worry about the rest of the cylinder dont mess with that , just polish the rod a very small amount , make it smooth , done hone it for ever 30 seconds of spinning it up and down your leg is good , re feel , clean it up put it back together and enjoy your new found consistent fps jump …. But as far as your description and issue i would check the oring thats inside your action army hop up
 
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