Based on looking at them thru the glass in several museums, it's a half-length cleaning rod that unscrews and pulls forward. And yes I know that in photos it looks like thefront sight will prevent this. When peering thru the glass it does not appear that it's a problem.
Could be wrong... but this is how it appeared from about six inches away at the military museum in Prague (where they have an EXCELLENT collection of US, German, Czech, and Russian small arms.. absolutely world class).
Willie
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