Magazine adapters.
 

I have a We G39C GBB.
While window shopping for parts and magazines, I've come across numerous M16 mags for lower prices, including some from We Tech.
And I have also noticed magazine adapters for AEGs that permit M16 magazines to be used in G36 variants.
So I'm wondering if such exist for GBBs too, specifically so I can stuff 16 boxes in my 36/39.
I just can't find sources or prices on the interwebs.

As of now there isnt. And i doubt there will be tho without ever comparing a g36 mag with my m4 mags i cant be certian it is imposible.
Chances are it is tho due to valve/valve striker locations

Nope.

Had a G39 and M4. Feed lips are different, top seal is different, release valve is not at the same spot.

So yes, you could modify a M4 mag adapter to fit a GBBR M4 mag, but it would not fire (in fact, it would probably break the nozzle when you try to load a round).

Fook...

Okay then, thanks guys. I just hoped since such exists for AEG it might for GBB.
I'll keep saving, lol.

Short answer is no, not that it's totally impossible, but extremely impractical and overcomplicated in redirecting both the gas and valve striker.

Besides, the G36 mags hold more gas lol