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This part rests above the barrel and can be removed when the barrel is removed. Does anyone know if this is a newly added feature and what it's purpose is, and if it's mandatory for the SCAR to function???? Any help would be appreciated.
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See how it has a little image of a cartridge on it? My theory is that it's like a little road sign to remind the cartridges which way they should go into the chamber. If they don't get confused then we get less misfeeds. ;)
 

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In early testing the 5.56 had stoppages with the casing got stuck in the receiver channel
above the barrel. So that is covering that area to prevent it
 
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