· Requiescat In Pace
Initially the HK416's were fitted with US made metal EPC's. After some time newer HK416's were fitted with a plastic ones made by HK or their sub for that. Primarily because it reduces supply issues and once the mold is made plastic ones are next to no cost to make. Over time HK has made many/most of the parts for these guns as there were supply issues and QA issues with other suppliers. You can best control such things by making all in house or with nearby subs.Ive seen some threads on here hit on the topic but never any oppions on which one members prefer.
Polymer or Metal...what would you chose and why ?
Would you replace the metal 416 ejection port cover with the mr556 polymer one ?
As far as performance both are the same and in fact the thicker plastic one may be stronger and less likely to slice open body parts. In fact the first HKM4's made (the HK416 before the Colt suit over the title "HKM4") had no EPC at all and smoked the reliability tests. Port covers are valuable only when you run around with the bolt locked rearward. Many many reliable weapons have no such thing so its usefulness is highly questionable. HK added it to the HK416 because the user community felt more comfortable having it then not becuase it was what they knew.