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I prefer the metal ones solely for the fact that when I separate the upper and lower, I close the ejection port cover to help hold the BCG in place (as HK bolt won't hold itself in battery due to the firing pin spring). The plastic ejection port cover on my MR556 would not stay closed if you were to hold it vertically (muzzle up), the weight of the BCG would cause it to open.

Pretty minor stuff, but that's my opinion on the matter.
 
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