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Expert Answer
Yes, the Geissele Super 42 Braided Wire Buffer Spring and Buffer Combo will be compatible with your Aero Precision M5 as long as you are using a carbine length buffer tube. I would recommend the H2 buffer.
Super 42 springs are only compatible with the included buffer. AR10/M5 use a shorter buffer to compensate for the longer BCG in the same length buffer tube. The correct AR10/M5 buffer is too large diameter for the Super 42 spring.