YHM makes two front sight flip models. The YHM-9584 is taller and is designed for placement on railed gas blocks which have rails that are lower than the receiver flat top rail. Weight: 2.6oz
A-15/EM-16 & A2 Front Sight, Front Sight Only "The Low-light Advantage". Get an advanced low light sight for less than the cost of most standard BUIS!