M11 (.380) bolt questions about ledge on back

[Slowmo]

I have an M11 .380 bolt that has a little ledge sticking out on the back of the bolt (shown on the bottom edge of the picture). I believe it is a cast bolt. A few questions:

1) Did original MAC and/or RPB bolts have that ledge?
2) What is the ledge for?
3) I noticed it cut a sliver off of a buffer I installed. Is that normal? I suppose the buffer might have been too wide.

 

[strobro32]

I had that on one of my RPB bolts. Someone told me that it was added to make sure there was not a visible space behind the bolt in the ejection port window.

 

[Slowmo]

I had that on one of my RPB bolts. Someone told me that it was added to make sure there was not a visible space behind the bolt in the ejection port window.

Thanks! Seems like as good an explanation as any.

 

[strobro32]

For me it was easy to check. Sure enough, without the extension, there would be a space behind the bolt in the ejection port window.

 

[MitchWerbellsGhost87]

It’s just another version of the cast bolt made by RPB. It was extended in that spot seemingly because the other version left a visible gap in the ejection port at the rear of the bolt. I’m not sure which casting MAC used. Fairly certain this one is RPB.

 

[Slowmo]

I was racking my brain trying to figure out why it was there and what function it could possibly serve. Sometimes it is easy to overlook the simple things.