Not sure where the 180,000,000 comes from?
90m divided by 11164 = 8,061 by my maths, which given likely includes optics and accessories as shown. However, I suspect the 90m is like all these new contracts, a lifetime support contract, so will include all support, spares, rebuilds, and maybe upgrades through the contract lifespan, likely 20+ years, in which case the 8k per unit is probably not excessive.