Mosin Nagant kB!

Thjere is a sign on the barrel saying this barrel was set back and rechambered.
Maybe they didn't set it back sufficiently and wrenched it in like hamfisted goblins and it developed a crack from that constant overpressure coupled with rounds fired.
You can see that a good part of the crack is corroded from a long time exposure. That it took so long to open is a tribute to the toughness of the design.
PP.
 
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