More going on than meets the eye here.

You have reported 29712 (as "1896") - at first, I thought you were speaking of the carbine now for sale at GB, but it is 29716 (and is - properly - "1895").

29714 (date not listed) is known to have been turned in from the 2nd Cav in 1900. AFAIK, there is no data yet recorded on the other two numbers, at least through 1995.

However, Mallory's book shows 30352 as the lowest-known "1896", and 30647 as the highest known "1895". I have thought something was amiss there for over 30 years. Could you please recheck that receiver stamping, VERY carefully?

There are many reasons why the stock(s) could have been changed, but there is no way to PROVE anything one way or the other. Arms in the 29xxx range would have originally had the thin-wrist stock - they broke, and were replaced.

A number that low was almost certainly used in the SAW, but finding out which regiment had it is highly unlikely. Those records which remain have been pretty thoroughly searched.