A5 low fps

i also have a remote line. i have tried hpa and c02, no big diff.

I presume your stock doesn't have a built-in regulator, but a built-in rear velocity adjuster.  These things can cause problems, as in your case where the in-stock RVA is not putting enough pressure on your drive spring.  You may need to replace the stock with something different.

But, first, as The Guy noted - is your forward velocity screw adjusted properly?  You cannot use the RVA only.

The spring may look all right but put it next to a new one.  I'll bet you'll find it a bit shorter than a new one.  I had a similar problem and a  new spring brought it back up.  I measured a new spring and it measures 4 5/16 long. 

I've also seen the front bolt o-ring to be a cause to a drop off in FPS.

I had an a-5 that would hit above 235 fps and inspected it. The front o-ring looked alright but I changed it anyway and it jumped over 300+ fps .

 

You may need a stronger drive spring. If this is the case, next time, make sure your gun is not left in the cocked position because that will make the spring weaker since it's being compressed constantly. Instead of buying a new spring, you can also insert a BB in the spring and get the same effect.

Good luck