I think 1” scopes are slightly more aesthetically pleasing on DGRs than 30 mm, but given limitations, especially for illuminated reticles, most of mine are 30 mm. I don’t believe I have actually seen 34 mm mounted yet (on a DGR). I have not checked lately, and perhaps the market is catching up with 34 mm, but at least in the not too distant past you could not buy Talley quick detach rings in 34 mm and Recknagel/EAW only made them for picatinny bases/rails. Perhaps the same for Alaska Arms. Then again, it is also quite possible that I am behind the times.

.