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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 10/6/2005 4:44:16 PM EDT
What is a keyhole upper?

I have a Bushmaster M4gery and it has a keyhole symbol on the right side of the upper itself.

Is there anything special about it?
Link Posted: 10/6/2005 4:48:43 PM EDT
Cerro Forge, nothing special.
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