Did you miss your chance on the last run of the MST-100’s? With enough interest*, they might be making a come back! These optics run $3,100, with military, and dealer** pricing available. If you are interested and willing to put a deposit down, send us an email to get on our interest list! We also have an interest list for the U.S Optics M40A1 mounts. If you want to snag one of those as well, make sure you let us know!
*Serious inquiries only. Deposits not required until production of the MST-100 has been announced.
**MAP policy will apply to dealer pricing. 

What is the MST-100?

Originally the MST-100 was developed by a joint effort between the U.S.M.C. and the John Unertl Optical Sight Co. in Pennsylvania. Around 1977-1979 the first deliveries were made to the Corps. John Unertl Co. continued to make the scopes until about 1999. After John’s death, Elsie Unertl could no longer keep up with replacements and repairs. She suggested the Corps contact U.S. Optics. Major Tafalla and the pertinent personnel from System Command came to the USO office in California in 2000 and surveyed the premises. Shortly thereafter, USO was contracted to refurbish, repair and replace the scopes in U.S.M.C. inventory. In addition, USO has modified, re-engineered and improved the scopes per U.S.M.C. requirements for the M40A1 and the M40A3.
The MST 100 is a fixed 10x optic with a 1″ tube. This optic is made out of steel and has a ‘recoil proof’ mil-dot reticle.


  • Power: 10x
  • Weight: 2lbs – 3.5oz
  • Tube: 1.00 inches
  • Tube (scope) material: Original steel material with stainless steel additions.
  • Length: 12.7” overall at “0” diopter setting
  • Reticle: Mil-Dot per U.S.M.C. specs.
  • Eye Relief:  3.5”
  • Objective Diameter: 36.5mm
  • Elevation Knob: Original 7 click  vernier  with 10 click  top knob  set for  175gr.  Load at 2550  F.P.S.  This  is a U.S.M.C. B.D.C. .308 elevation knob with original M.O.A. settings.
  • Windage Knobs: 8 M.O.A. standard U.S.M.C. Knob.
  • Parallax Setting: 100 yards

Get on our interest list! sales@usoptics.com

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