Fit on aero precision upper with some modification - Devil Dog Concepts Hard Charger Rear Handle

So this item is awesome. I had to shave a small bit off of the tip of the charging handle pin. the mount was perfectly in between the rail on the Aero Precision upper. If I moved it forward it hit the hand grip. Rearward it didn't allow the charging handle to lock. Once shaved down the rear rail slot locked perfect. Nothing 2 minutes on a dremmel couldn't handle. The part that was shaved is hidden so still looks unmodified. functionally it took a few attempts racking it to get to finally cycle without binding on itself. Apply some extra grease and your good to go.