EDgun Edgun R5 low velocity problem

I have a used Edgun R5 multishot .25 cal. It was shooting consistent 880-885 fps.

i took it out the other day and suddenly it is now shooting slower than my Daisy Red Ryder…200 fps. I can actually see th pellet slowly lobbed from the barrel.

any help is appreciated to fix problem.
You need to do a full service i would take it apart replace all the o-rings def check the regulater o-rings that sounds like the problem also amazon has large o-ring kits for like 15 bucks all diffrent sizes with a chart that way you def get what you need, I bought 1 metric and 1 regular bin using forever they work great hope all works out for you anything you may need hit me up
 
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