Help indentify part on an old Colt AR

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So I got a Colt A2 Sporter in, can't say I've ever seen this before - any ideas?

tYsq5Yr.jpg


inb4 Whatever it is it should be banned for the children, shoulder thing that goes up, etc
 
I've been around ARs for a long time (by no means an expert though) and I have never seen anything like it.

Are you sure it's not an alien life form trying to get you to do something bad?

added: Does the rest of the rifle seem to be stock?
 
Just a guess. Something to do with slipping the bayonet over it, keeping it pushed back against the lug? Keeps the bayonet more stable.
I'm calling it a bayonet support spring.
 
Just a guess. Something to do with slipping the bayonet over it, keeping it pushed back against the lug? Keeps the bayonet more stable.
I'm calling it a bayonet support spring.
It has been a while for me, but does the bayonet ring even go that far back?
 
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