HERE IS THE Custom roms for Moto G3 2015 3rd generation model XT1550 and XT1540 [OSPREY],you must try these roms After rooting and flashing Custom recovery in it.
AOSP is Android as Google publish without other modifications. More or less AOSP is the Nexus devices stock rom without gapps.
Anyway to get a working system I added some changes from CodeAurora Forum and CyanogenMod. I added also 3 non-AOSP features for a better user experience (Advanced Reboot, "Clear All" button in Recents and an option to delete screenshots from the notification area) and I'm NOT going to add something other.
#Download - ROM