Strange 10/22 Bolt?

[Wham-O]

I was just looking through my 10/22 bolts to start polishing some and noticed one that was vastly different from the others??
It seems to have a lot more center meat and a different bottom contour cut to it all together?
Look at the bottom bolt VS the top bolt (top being a OEM ruger 10/22 bolt)
Does anyone have a bolt like this?
If so, what make is it?
(sorry for the crappy pics....)

 

[ginnz]

Holy Smokes! Thats an Israeli Full Auto Massad Bolt! Where the 'ell did you get that!!!! I'd go underground ASAP! CSIS will prolly be knocking on your door any second now!

just jking.... ;-0 Never seen one. very interesting.....

 

[Wham-O]

Holy Smokes! Thats an Israeli Full Auto Massad Bolt! Where the 'ell did you get that!!!! I'd go underground ASAP! CSIS will prolly be knocking on your door any second now!

DAMN...you got me excited ginnz!
I was going to pop it in my next build.

 

[Innercity]

I've never seen a magnum bolt but that could be one.

 

[mikeystew]

I've never seen a magnum bolt but that could be one.

Thats what i was thinking. Perhaps its a magnum.

 

[m777]

Just opened up my 10/22M. Guessing not magnum

Bought it used. But guessing all the parts are stock
Clint

 

[Dr.Lector]

http://www.canadiangunnutz.com/forum/showthread.php?p=4211249

....................
When looking for bolts, some of you may find some oddities still floating around.
There are some old 60's (early 70's) style bolts with a different undercut.
Be aware that usually those bolts will work only with those years' trigger groups.
If they are paired with newer style trigger groups, the protruding undercut
may touch the front of the trigger group before the bolt completely rests on the barrel breech.

....................

 

[Wham-O]

Ahhhhhh!...
Case solved, thanks to the good Doctor.

 

[Jahred.F]

I was going to suggest AMT lightning.