Thius is the first time I have ever heard of such a thing, but it should give all Mosin-Nagant shooters something to be aware of.
Here's a link:
http://www.armoryblog.com/firearms/rifles/mosin-nagant-hex-receiver-cracks-in-half/
Here's a link:
http://www.armoryblog.com/firearms/rifles/mosin-nagant-hex-receiver-cracks-in-half/