Does anybody know if the ejection port cover on a left handed upper is different from a standard lower? I know it flips up but not sure if the port cover rod, spring and clip are different in anyway. I’m planning on getting a Black Rain Ordnance left handed upper. I rather get a stripped upper but they do sell one with the forward assist and cover installed. I don’t like the “Let it Rain” on the cover much and would rather have a plain black one. Plus it’s a $60 plus price difference.