Other Spanish Features
Replacement Blade front sight:
The first miscellaneous feature of note will be the blade front sight. Prior to adopting the M1891/30 style globe and post front sight, Mosin Nagant rifles used a blade sight without a sight cover. Even the first years of M1891/30 production featured this blade style sight. This only lasted until around 1932 or so, with all rifles afterwards featuring the globe and post sight. However, on many Spanish Civil War Mosin Nagants it is possible to find this blade sight on rifles dated long after the 1932 cutoff date. This is most likely the result of the Spanish replacing broken parts with what they had from the huge assortment of Russian arms they were supplied with.
Another common feature of Spanish Civil War Mosin Nagants is a heavily sanded stock. This feature is particularly difficult to solidly link to Spanish origin. It is common practice in the United States for gun owners to sand and refinish military rifle stock. In many cases a sanded stock will only indicate that a previous owner of the rifle started this refinishing process and never finished it. However, if a rifle also has several of the previously discussed Spanish Civil War features, than it is entirely possible that the sanding was actually done in Spain. Why was this done by the Spanish? While no one can say for sure, more than likely these rifles were sanded as part of a general refurbishment of these rifles sometime after the Spanish Civil War ended.
 http://7.62x54r.net/MosinID/MosinFeatures02.htm, “Soviet M91/30”
 Note: It is also fairly common to find Finnish rifles that would not originally have had blade front sights with one installed on it. Therefore this feature alone will not prove SCW lineage.
 Pun not intended, ha!