That varies unit to unit. The units that I have deployed with (4-64 AR and 3-15 IN, 4BDE, 3ID) used the "arms room" concept. We had enough M150 and M68 for each squad leader to tailor his squad how he saw fit. If I wanted to I could have have run nothing but M150s or M68s or a mix of the two. Additionally we had EOTech, Leupold MK4 CQ/T and Trijicon RX30s. I can't think of anytime since 2004 that I have not had ample variety of optics, lights and lasers available. I would hope BFC is basing the optic availability off of the current MToE.