Thanks. Mike actually mounted it there for the photos before he shipped the gun. Its a matter of preference really. On this gun the grip can be mounted side or bottom, but since the bottom is railed on the Raven it will require an adapter or a different grip than the standard HK one. I do plan to use the grip in the bottom position for off hand shooting on it (like an M60).
Here are some examples of side and bottom grip positions for a standard HK-E gun front end - in this case on a Terry Dyer RR 23E:
[video]https://lh3.googleusercontent.com/MtYTu0nWseofYv9WS6tdiG24wJtWGFuYurC1HfWvbVF9PbpK2Z 6xn2_RQgZlw56wPHqLvMvr9MSGffe9UHP6pJWT3UXh5xEk9FRZ Tw3YhFS6ZeqdVzfR1uj0bCVeKGtGnHMDLp-wGsjrtNC0mRK_fdUDWqGnj0U_ONbVDST5pjnJ8dXEwh7wz8FwO tcVqXs2yHuz23ABgO-pSfuBW3ieNUc0okacjCcc_WvD-eXjD3FC12mKXRcVm_UfSjXiDaTATZZOj6C2MqAcfEHRkV6SYVd qxGghwLGFVCFzUh1E4iR0BOqmq42ZC4gsEnHwo1Ez5pg937x2i JsAmQOVNMlLZNH_YQRWeu3MnUGiuxFwzxdsh0fpjiDJlvj4Mx2 1akufHmkyO7Wy-zgczzhoziQvGwQ58zRLKi9GcTXJaqNbpKa2ttlef0-WGw378wfPhLErnQgeNeD0vO4FcnxbOD09Pcr5ikZfWhqLykgQ3 LwoZJNjrbyxm-tWkyaHa5tRMFnPz2AzDayogbK8v9OQGinOs6OhYP_29-oKLCXdTUXg31X0_K8q1-CI0Oj8nnX-1R6jAco_EYBdwNKL1xpVIheUKPIBcjbj_6wctEPTOuoEic6KQ4 qHP8AzKm52SZpXKzjV5POxCzQHM34vMZVvgkncP4FlbkxIyXJT 5F08in8L40MKhFDITJ0vL1yHTZM7L2QQpxqIWExegjaQTQWuWQ EeJBAejOoTRv9i5SYMhuYaNo7xgzH3=m22?cpn=M9rheRlfTDZ D2sRq&c=WEB_EMBEDDED_PLAYER&cver=20191212[/video]