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Expert Answer
Yes, the Griffin Armament Griffin Stock Mounting Kit will be compatible with the Aero M5 lower receiver. It includes the AR-SOB buffer which weighs 4.9 ounces and can be used in suppressed 5.56mm rifles and in 308 carbines as a replacement for H2 and H3 buffers.
This kit will not work with an Aero M5 receiver. This receiver extension only works with the AR15 platform unless you swap out the AR15 buffer with a shorter buffer (2.5" in length) AND replace the spring with a 308 carbine spring to accommodate for the longer 308 carrier.
I would suggest looking at Griffin Armaments home site and asking the technicians there.