Whats its doing?? I have an M93R they are fun guns to shoot. Back to your problem what is it doing??
Is it jamming if so lube the slide and the rail.
If it shooting but sometimes BBs pour out the barrell lube the HOP Up unit inside the barrell or adjust it with allen wrench provide.
If its an Magazine problem you can the mag apart with a screw drive to press down on the nocht in the bottom of the mag this lets the bottom slide plate slide free. From here all depends on how far you want to break it down.
Remember that there is a point of no return. The good thing is that most Airsofts forums and websites carry M93R from KSC, KSA, and KWA.