Does anybody know how much of the HK MR556 is compatible with mil spec AR-15s such as Colts and BCMs? I know that many aspects of the design were changed to meet the 1989 import ban standards, but I would like to know what parts can be changed out with commonly found US made parts. Mostly I'm talking about stocks, grips, lowers, charging handles, pins, ......etc. Also, is there a spec sheet on the differences between the 416 and the MR556? Thanks.
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