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the tappet spring doesn't attach.. it sits in a channel and compresses on the stroke rather than v2/3 where it extends.
Have you tried shooting it with no magazine? Drop bbs into the hopup by hand, if it shoots try a 60 round low cap.. if it shoots, try a midcap. I have little faith with midcaps and E1 p90s. If it shoots fine with a 60 rounder, either stick to those or try a king arms 90 round midcap.
A sector chip will not fix this issue if the BB is not falling into the hopup chamber.. the delayer just holds the nozzle back for a fraction of a second longer. If your BB is physically not falling into the hopup on semi, then the tappet is too far forward or the nozzle is too long. Since the tappet is a set length, the nozzle is too long.
Here's a question, why would you use bore up parts? Are you putting a barrel longer than 400mm on the gun? What bore up parts exactly did you use?
I am not a fan of the E1 p90 gearbox... I've had never ending issues on the one that I had, and ended up just scavenging parts from it since the gearbox would never feed properly.
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