If you have a great fcr Ammy with res, by all means, go for it. A “shitty Mara’s” does the job fine but if you wanna spend the extra on the GG Ammy why would that be an issue? I didn’t think I needed to mention that in the guide
a 5 fg throwaway craft with 2/8+ works as well as any mara. you don't need a "gg ammy".
or you could just replace a BK with an fcr ring
you're welcome mate