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Rifle serial number may be on magazine (post-war).
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Rifle serial number on underside of the forestock near the front.mismatched but they believe they are matching). As well sometimes there are honest mistakes by sellers who do not know the details of their rifles (e.g. Due to the rarity of this sniper equipment, and the high demand for the among collectors and shooters, there is the also danger of forgery. The most common are the BSA Shirley made rifles.
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As a result, probably over 90% of the sets in North America are mismatched. Sadly when many of the surplus dealers sold them, they did not ensure that the matched scope/bracket/scope case sets went with the correct rifles. It appears that thousands of these sets came to North America as surplus after World War II. These look great but as the scope and rifle are not collimated, they will not be as accurate at all ranges.