Great pics and diagram!  The trigger/sear on the rifle is disassembled.  I was confused by the "hole" in the end of the sear.  The cutoff was also removed for the installation of a receiver sight.

Question: I was planning on installing a 1902 rear sight due to the ease of adjustment (I think) but the rifle came with a 1901 sight and matching handguard.  If I use the 1902 I'll have to get a handguard.  For actual range/match use, are either of these sights better than the other?