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Author Topic: RAP4 mets shell eject problems driving me mad  (Read 1384 times)

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Offline spaspeckerthedull

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RAP4 mets shell eject problems driving me mad
« on: September 05, 2012, 03:05:11 PM »
OK guys - rap4 METS yellow dot. BB conversion kit, BB shells

load shell with BB, fill mag then put in gun. Pull trigger, and all I can hear is gas coming through, BB does not move and shell is not ejected. Pull trigger again immediately and everything is OK and works as it should. Pull trigger again and 2 or 3 shells are ejected at once. Pull trigger again, shell jams. Each full mag is usually a combination of the above

solutions I have tried:

adjusting barrel so it doesn't "clamp" the shell
different shells each time, with much the same results
different gas tubes
replaced all core o-rings
tried different mags
adjusted velocity/rof with pressure gauge
replaced kicker spring
checked ejector unit opposite of kicker arm for burrs (results of dry firing)


all problems occur during semi auto fire only, full auto is NOT allowed here in UK.

and that's it - is there anything I have missed?


Offline Kevin_RAP4

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Re: RAP4 mets shell eject problems driving me mad
« Reply #1 on: September 06, 2012, 08:30:56 AM »
Can you take a picture of your chamber and show how the barrel insert is positioned? You might be missing the rubber grommet that seals the barrel to the chamber.