ghk g5 magazine doesn't load
 

It feels like i'm breaking the speed loader trying to get bbs inside, and i can't load more than 21 rounds while it supposed to go up to 38, help please?

You need the special lip that you were supposed to come with the gun.

Go to Samoon on google, and e-mail them saying you need a replacement speed loader lip, they'll mail it to you for free, as long as you pay for postage ($1.50?)

Else the spring may be stiff, and needs to be worn in a bit, a small drop of silicon oil may help a little, but yeah. GHK mags, you need the loader tip, else it sucks ass to load it.

I do have the tip for the speed loader.

where should i drop the silicon oil. There is no access to the spring like in TM or KWA guns. Do i need to disassemble the magazine?

Very berry easy to disassemble. Get a small pin or something and remove the bottom plate very very slowly. That Pin you pushed in will fly out so be careful. After that you can access everything.