G&G m14 mags?

[point-blank]

considering a G&G soc16 and I wanted a little info on the mags
how do these feed?
are they durable?
Do they seat well in the gun?
Anything else?
Does any other manufacturer make mags that will work in this gun?

Thanks

[Toothbrush]

At present, only G&G mags will work with G&G M14s