Purpose of Item: The Geissele Super Modular Rail MK4 (SMR) was designed as an ultra light weight rail system for the M4 Carbine and all mil-spec AR-15 variants. Here is the most recent upper I built around this rail. The rail is strong, and gives me rail points where I need them and nowhere that I don't, saving weight. So far MK4 rail is one of the nicest and functional free float rails out there. As with their triggers, Geissele Automatics craftsmanship and attention to detail is second to none. I'll be up front, this is probably my favorite rail right now.
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