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Discussion Starter · #1 ·
What is this hole for? It is a picture of a Colt LE6933 FA Bolt carrier on Gun Broker. Mind does not have this.

 

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Discussion Starter · #3 ·
Its from a complete... lightly used LE6933 upper. This guy has a few of them on GB Auction # 349994650. From all the pics he has it looks new to me, but as you suggest it might be some kind of mod, but for what?

 
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