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I have an Angry Gun 509mm barrel in my MSR and it ends right at the tip of the flash hider. If the fash hider and the extension are screwed all the way on, as in how it comes stock, then the 509mm barrel sticks far out the front past the flash hider. A 555mm will stick out even further. I modded a silencer from a BAR 10 G Spec to fit my MSR to cover up the extra bit of barrel.
I n other words the 555mm is going to be far to long and the flash hider wont cover it up.
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