Problem with mag on new receiver

[Giliador]

I got new (used) Aimtop body to replace my cm16 green polymer one, once swapped I noticed my G&G high capacity mag won't even go in magwell, it get stuck like the mag is too wide by 1-2mm. I have contacted seller and he previously used G&G mags with this receiver, will test G&P one today, anyone had similar issue? I noticed on different forum thath someone was selling few mags and on pic G&G one looked slightly wider.

[Baz JJ]

G&G are a problem with many mags. I usually use G&G mags with G&G guns and other makes with non guay guay products.