I've been using my VSR minus an airbrake for over 6 years now and nothings broken yet, but I am using a PSS piston, which may make a difference 
You can expect 2 things if you cut off the airbrake 1) It will become noticeably louder and 2) you will gain approximately 40 fps.
If you buy the PSS piston you have the option of screwing the airbrake on or off the piston so you can trial each combination before you settle on a permanent option.
I can also show you mods that can be achieved easily and with minimum outlay that will take the rifle close to or over the 500 fps mark
EDIT I forgot I already did it for someone else on here in this link
My advise is to try the mods in the link first and then trim the airbrake to suit after, or if you just want to max out on fps do it all and then you should be round the 550 fps mark
You can expect 2 things if you cut off the airbrake 1) It will become noticeably louder and 2) you will gain approximately 40 fps.If you buy the PSS piston you have the option of screwing the airbrake on or off the piston so you can trial each combination before you settle on a permanent option.
I can also show you mods that can be achieved easily and with minimum outlay that will take the rifle close to or over the 500 fps mark
EDIT I forgot I already did it for someone else on here in this link
My advise is to try the mods in the link first and then trim the airbrake to suit after, or if you just want to max out on fps do it all and then you should be round the 550 fps mark
