Marui Tac Master Metal body parts

[Yubnub]

Hi guys,

First post and a flag up for some help on my Marui TM M9.

Getting really fed up with having to replace the top slide on this gun and looking to do the full metal kit mod. The Guarder one is available still out there but I don't hear great things about it. The G&G one is meant to be better quality but is now rarer than unicorn tears.

Does anyone have any experience of either kit?

Thanks a lot.