While researching Zaku online, I came across someone who'd built an amazing Zaku, and when I saw that their Zaku was equipped with the RE Ifrit Custom arm grenades, I took inspiration...
Or rather, copied them. 🙇
Well, what I'm doing is basically copying what all other modelers are doing. 🤣
In the HG series, some people have transplanted the Ifrit's arm grenades onto Zakus, and I thought I'd give it a try when the time came to build a Zaku! ️
I happened to find a pre-assembled RE Ifrit arm listed on Yahoo! Auctions, and modified it.

MG THE ORIGIN Char's High Mobility Zaku II 4 | えてめた's Gunpla works