[PRD1]

I just acquired a 7.65mm Luger pistol in fair-to- middling condition overall, and with a bore which is tired, but shootable (and it shoots/groups fairly well, all things considered). However... it groups a good foot low at ca. 15 yards. I could shorten the front sight, but would rather not. The rear sight, however, is of a configuration unfamiliar to me: it is very low and rounded, rather than raised in the form of a blade some distance above the rear toggle section, and the notch is fairly shallow. It does not appear that the rear sight/toggle have been altered, but the apparent difficulty with elevation causes me to wonder whether the rear sight and toggle segment are correct in this pistol. All the numbers appear to match in the pistol, and the only proofs are commercial - the receiver ring appears to have been 'scrubbed' and the pistol refinished early-on, and 'Made in Germany' appears on the right side of the upper receiver. I guess this may be a post WW1 rebuild, but am not familiar enough with Luger pistols to do otherwise than guess. I want to shoot the pistol, and don't think the collector world would be offended by my doing so, due to the overall condition of the gun, but think the current sight regulation is objectionable.
The actual thrust of my question is whether the rear sight and toggle section are correct for this pistol, and whether replacing that part with a standard P08 part might solve the elevation problem. If so, where might I best look for the replacement? I have dealt with Ralph Shattuck in the past, but, sadly, he is no longer with us.
Any assistance would be appreciated.
PRD1 - mhb - Mike