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Discussion Starter #1
Hello FNF

i was disassembling my 16s and when I knocked the barrel off I saw a black piece of plastic that sits on the rails section. It is black, and I'm not sure what it's function is or where is supposed to go. I included two pictures, one with the barrel off when I first saw it then one with the barrel back on. Is this where it is supposed to go? What is it's purpose?

Thanks in advance.
image.jpg
 

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Discussion Starter #4
I tried on my phone to find a tread on this subject but I came up with nothing. Thanks everyone! Looks like I'm good to go.
 
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