There is no doubt that the forum will become a treasure chest of information on this topic and it should increase at a very rapid pace given the volume at which the NOE R92 picatinny rails are being purchased.
I would like to highlight a few differences in the mount and the why behind them. The most obvious is the height, the NOE rail is .165" higher than the Rossi base.
The primary source of the increase came from maintaining the picatinny rail spec. In that the underside of the base had to be milled to fit the barrel taper contour, Al and I discussed the additional height in depth but maintaining the spec dimensions was a major consideration. Examples where manufactured that mirrored the Rossi product and the product that you now hold in your hand.
There was an issue when it came to mounting the Rossi mirror and it centered on screw length. The shortest screw length available, in Al's opinion, did not provide enough security for the mount. Relaying my experience confirmed his suspicions as only two and a half threads are engaged in the barrel with the screw head seated in the mount.
Four out of five of my Rossi base installations have experienced stripped screws because the screws are not long enough to fully seat in the barrel.
Al suggest that the next longer screws be used and mill the base only enough in ensure that the mount screws are fully engaged. He also discussed custom screws that would allow him to mill the rail to near the Rossi height but he would have to do that work in house and detailed it for me. The bottom line is that it would have significantly impacted the cost of the rail and probably made it unsellable.
The bottom line is that the NOE rail is higher than the Rossi base but Al was able to provide a picatinny spec product that is securely attached to the barrel.
