Lincon coller weirdness

if you look at lincons coller, it looks like something happened, its got some kind of indentation, looks perfectly round in the indentation and his coller looks distorted in the front. It's probably pmd but this been bugging me lol so I figured I post it

 

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A very hard hit to the coin that shoved the metal forward is my best guess.

 

There you have it.

 

Thanks lol I figured. Someone popped his coller. Lol