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Looking for ideas on a piston build. I was originally planning on just using a superlative kit but then my mind started wandering Into the possibilities. I've been exploring the idea of building a modified mr556 system but haven't quite figured out how yet. I'd like to maintain as much " milspec" compatibility as possible. I'm pretty sure I could modify a standard BCG into an mr556 style BCG (or just use one) but I don't feel like paying hk money. The only hang up I have on getting an mr556 system to work is the barrel/gas block. On ideas on over coming that obstacle? Any alternative piston build ideas? I like the idea of a long stroke system, but I'm not married to it.