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What is this Sig550 part?

3894 Views 5 Replies 4 Participants Last post by  Wolfgeorge
I always wondered what the long monolithic flat thing on top of 550s was, and since I might attempt to build one in the future, does anyone know what it's called, what function it serves, and what it's made out of? If someone could tell me that would be great!

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Thanks man! Sig Sauer never cuts corners, and it's a shame that it's discontinued.
1 - 2 of 6 Posts
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