Midwest Industries Flip Up Sight - Front Gas Block : Bowers Tactical, featuring products from Accuracy International, ARMS, Bianchi, Blackhawk, Buffer Technologies, Bulldog, CQB Solutions, Don Hume, First Samco, Fobus, GG&G, Gemtech, Global Tacital Supply, Hakko, Insight Technologies, LMT, Magpul Industries, Meprolight, Peltor, Starlight, Steiner, Streamlight, Tango Down LLC, Uncle Mike's, and Wiley X