Since the Baby Hi-Capa has the shortest grip of the whole Hi-Capa family you can use any TM Hi-Capa 5.1 & 4.3 or WE Hi-Capa 3.8 & 5.1 magazine. The new WE Hi-Capa 4.3 mags should work but that hasn't been 100% proven to me yet. Just be aware that all of the above mags except the ones designed for the 3.8 will stick out of the bottom of the grip.
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