On page 147 there is a Caution:
A huge number of surplus Mosin-Nagants and Mosin-Nagant parts have been imported into Western Nations, especially the United States, since the collapse of the Soviet empire on late 1991. Among these items are a few genuine, Soviet-fabricated sniper rifles; however, most M1891/30 rifles advertised as sniper models have been cobbled together by dealers from common rifles and authentic soviet-made snayperskaya bolt handles, scopes, and scope mounts. At this writing, parts or fully assembled "sniper" rifles can be purchased for comparatively reasonable prices. I mention this in order to warn the prospective snayperskaya buyer that his purchase will almost certainly be a postwar reproduction assembled in the United States by the importer or dealer, even if all parts are from the same arsenal and in the same condition of wear. When considering a purchase, remove the scope from the mount and pay particular attention to the screws used to attach the mount to the receiver, see Figure 4-5. The two main screws are held in place by lock screws, which were professionally applied. A sloppy job strongly suggest a non-Soviet assembly.