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I recall the S&W M&P Sport has neither the door nor the bump, just a slick right side - easier to extrude, I guess...

Well, when I built my first two AR's (and the first ones I owned) I started from the ground up with good parts - like Aero Precision - but not necessarily name-brand parts. If I could save a few bucks on a door or a swivel I would too - but I spent the REAL money on my BCG, barrel, optics and...

I think the "plastic ejection cover" is likely one of the snap-in type made by Strike Industries. Since it's not really a high-importance item I really don't care. Some AR's these days don't even have doors anymore.