Brent, the high front sight on many 1903s is due to the high hump on the rear bridge of these rifles. The high rear bridge, when used with a receiver sight such as the Lyman 48, will often be found with a somewhat higher-than-normal front bead so that the sights would zero properly. I find that a front bead that's 1 1/16" above bore centerline will zero well with the 30-06 cartridge & Lyman 48 while the 22LR Springfields can use a lower normal-height front bead. Front band-type ramps of this height have been difficult for me to find recently and I'm still looking, have had to use a few older ones that I was lucky enough to squirrel away long ago.
I concur about the Sedgley speedlock striker, its forward position looks identical to mine. It should also have a stronger mainspring to go with the speedlock, at least mine does.
Regards, Joe
