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After finding several covers that stated they were not compatible with an Aero Precision M4E1 upper, I stumbled across this one. After being unable to find the compatibility of this cover, I decided to take a chance and order it. At first it didn't wanna stay shut, but after adding a drop of oil to the ball and working it in, it now fuctions flawlessly, and stays tightly shut. Will be buying again for future builds.
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