WHAT DOES HK-416D MEAN?

What Does hk-416d Mean?

This is certainly mine, all Plastic. This is often as I took the cover off no mods. My believed, is there a difference between the new plastic assy vs the metal a single in how the Kit would purpose? You fellas who say you have performed just one with no problems, which was it plastic or steel? Other features in the HK416 include things like a mod

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