HBM-23 Airsoft M4 Buffer Tube Adapter

I wanted to use an airsoft stock on my HBM-23 but there were no adapters readily available. This part allows you to use any airsoft M4 style buffer tube on your HBM-23. Then you can use any adjustable M4 style stock.

Uses 4 M3x8 screws. Also uses the mounting screw that usually comes with the buffer tube.