I see your point LC bit I still think it's likely a Tula star like an R on a Remington part is a Remington R, or an E is an Eddystone part for American firearms. Why only this part has a star? Perhaps the scarcity of Tula stars on SKS parts is due to the extensive serialization of parts on an SKS, such that marking them with a star was superfluous. Tula Mosins have a plethora of star marked parts (e.g., barrel bands, various bolt parts, but not all parts). However, this is on a series of rifles with only four serialized parts.