Those are actually factory made purple mags, they were selling them for a limited time along with Robin's egg blue and red. Email them to see if any are still available. Midway had them as well.
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Your little girl is just too cute for words! :)
I think I'll build a purple AR for my granddaughter. She's 5 and likes pink, but loves the purple fleece vest I bought her the other day.
Those purple ALG rails are very popular.