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BUIS question

Discussion in 'GATE AR-15 Forum' started by engineer151515, Jul 26, 2010.

  1. engineer151515


    Nov 3, 2003
    I'm looking at a Midwest Industries (MI) BUIS for an M4A3 Bushmaster with the stock fixed front sight.

    Would a SPLP (same plane low profile) BUIS work correctly or is their ERS (emergency rear sight) the correct choice? Other than one being a "low profile design", I'm not sure if there is a difference where one sight is used only with gas block front folding sights or whatnot.

  2. Constructor

    Constructor Moderator

    Dec 10, 2009
    The same plane sights are made to mount on a rail or gas block the same height as the receiver, all rear sights should be the same height.
    If you plan to mount a front sight on a lower gas block then you need to buy the taller front sight.

    Last edited: Jul 26, 2010