Better options would be the M845 with a high HALO L3 tube (still unsure as to whether the tube would be warrantied if recoil damage occurs.)
Or the best option would be a mount that would allow a clip on like the PVS-22 or the new Mini Wasp, coming from TNVC soon, which should be in the price range of a D-760.
You could also get a LaRue QD mount for your D-740, and check the HALO on your tube. If its well above 1.0, your D-740 might handle the recoil. The QD mount are also made by TNVC.
I currently have one of these suppressed rifles and finding a picatinny rail mount that's long enough to hold a clip-on has been difficult. I eventually just went with an IR laser and helmet mounted PVS 14 because the shots I take with subs are 30-75 yards anyway. Its just a difficult rifle to which to mount NV.