Elite Force M4 quadrail
thingiverse
I've got a customized quad-rail system designed specifically for my Elite Force CQC and several Ares Airsoft M4 and AR-15 models. The rail fits seamlessly onto my CQC, so I know it works great for this platform. You might need to tweak it slightly to get it working perfectly with real steel variants, though. Instructions: Print the quad-rail with a negative for the mount on your bed. It's also a good idea to use some supports to help it come out right.
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