A friend showed me a recent inheritance that appears to be in fair shape, but I don't know much about it.  It is a Springfield s/n in the mid 200,000's.  The cartouch is clear, I think it was 1900.  The rear sight has marking to about 2,ooo yards and has a very small peep that can be rotated up to align with the notch.  What is special is that there is a pistol grip section of about 10-12"that has been inlaid to the stock and the entire rear portion (about 4") of the stock appears to have been spliced in.  It still has the metal buttplate.
Were these modifications common?  Do they affect the value?  And what would be an approximate value of a rifle like this?
Thank you for any information you can offer.