Tokyo Marui 870 MCS

[Ninja_En_Short]

Hi guys,

I have been scratching my head with this one for weeks so I will post the question here : I have a gas powered 870 that refuses to shoot, more precisely the trigger does not work while arming is perfectly fine.
When exploring this (uselessly) complicated system I realised the piece that support the part meant to make the link between the trigger and sear (the pointy one held by screw) is not coming fully forward because the pump itself does not go the last 5-8mm at the end of the cycle (the support itself is not blocked and when I push it completely with a screwdriver the gun get into battery completely).
I also noticed the right rod (when holding the gun) connected to the pump does not seem to have the same curve as the left and seem to go inward.

So do any of this rings any bell for one, and for two : would I be right to sand a bit that right rod which I'm pretty sure is getting caught in the receiver ?

Thank you,
Ninja

PS : I'm at work but I'll post pictures later if need be.