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For those who do now know the MST-100 is the US Optics built version of the Unertl 10x USMC Sniper Scope that was designed for the M40A1 Sniper Rifle. The body of the scope is Stainless Steel, unlike newer optics made from aluminum. It is ballistically cammed to the M118LR cartridge and can get to 1000 yards real quick. It is an extremely well made optic. The only change on this one, versus the scope that was on my issued M40A1 is that the MST uses a coil spring for erector positioning. The old Unertls used leaf springs. When USO rebuilt the Unertl 10x's under contract they replaced the leaf springs with coil springs and incorporated this in their design.Here is a neat schematic of the MST-100 courtesy of John at USO.
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