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Here is the Miroku M-bolt bolt.
M-bolt is the same as the original A-bolt, but with different a different bolt handle and shroud.
In order to insert into rifle you need to spin it so that collar...

Certainly a Browning. Mechanically it looks the same as a Miroku M-bolt I had, which im familiar with - which was the same as the original browning A-bolt.

Im not familiar with the X-bolt, so...