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What would cause this?
I was recently off down close to N.O's and in the shop was this damaged the guy said BM-59?
Looked correct, Magazine fed and everything so here it is.
 

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CMP has a lot of old M1 receivers with same broken off heel. My guess is a worn recoil spring that allows the bolt to hit the heel with too much force, breaking it off - but that is just my theory.

I have a BM59 project underway. Here's the parts with an extra stock:
Trigger Air gun Gun accessory Shotgun Metal
 

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CMP has a lot of old M1 receivers with same broken off heel. My guess is a worn recoil spring that allows the bolt to hit the heel with too much force, breaking it off - but that is just my theory.

I have a BM59 project underway. Here's the parts with an extra stock:
View attachment 483256
I think you're probably right on most of those old broken receivers. Nice project parts kit!
 
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