Re: LA Picatinny Rail
Mine is mounted so it's a little tough to measure any worthwhile reference points.
As near as I can eyeball, the front is .325" between the top of the reciever and the bottom of the clamp groove, at the junction of the recoil lug/action.
The back is .465", maybe, from the top of the reciever to the bottom of the clamp groove, at the very back end of the rail.
The distance between those two points is approx 6.315"
Mine is an EGW.........