Available only through Sentinel Tactical is a glass etched reticle retrofit for the USMC UNERTL MST-100 & MST-100M.

If you own a USMC MST-100 from an M40a1 or the Canadian C3A1 MST-100M scope you will understand why the glass etched reticle is a great idea. All of these old scopes are just waiting for the tungsten reticle wire to fail rendering the scope useless. It is amazing what John Unertl was able to accomplish when he designed and built these scopes creating the first Mildot scope, with the resin dots on the tungsten wire, perfectly spaced to create the Mildot reticle, amazing craftsmanship that is extremely difficult to replicate.

The glass etched reticle takes this to the modern era with no discernable optical difference with the exception of perfection in spacing of the bars and dots to a true mildot. The dots are a cleaner round shape rather than the inconsistent football-ish shapes made by dripping resin onto the wire. If there was enough interest we could produce etched football reticles as well as the true mildot.

For about 5% the value of your optic you can have the cell needed to repair your piece of history.

Reticle cell available for $149.99 shipped to CONUS and Canada

Additional items needed to complete this work, click the pic and it will take you to the link.

USMC MST-100 & MST-100M Glass etched reticle retrofitUSMC MST-100 & MST-100M Glass etched reticle retrofitUSMC MST-100 & MST-100M Glass etched reticle retrofitUSMC MST-100 & MST-100M Glass etched reticle retrofitUSMC MST-100 & MST-100M Glass etched reticle retrofitUSMC MST-100 & MST-100M Glass etched reticle retrofit

USMC MST-100 & MST-100M Glass etched reticle retrofit instruction

Step 1 – Thoroughly clean the exterior of the optic
It is important the optic is clean and free of dust, oils and debris that could potentially get inside the optic when doing the conversion. Use a tooth brush and thoroughly clean the exterior except the lenses, then use glass cleaner and thoroughly clean and blow off the body with compressed air.

Step 2 – Remove the rear eyepiece tube from the optic.
The eyepiece tube threads into the erector assembly with right hand thread. Unthread it and set it aside for reassembly later. You may need to mount a scope ring to the tube to give you leverage to unthread the tube.

Step 3 – Reticle cell and tension spring removal
The reticle cell will lift free from the turret body, it is not threaded, only slide fit. The reticle cell body has an index pin at the 12 o’clock position. The two tension leaf springs will lift free from the turret body at the same time.

Step 4 – Preparation for reticle installation
The old wire and bars need to be removed from the brass reticle cell as shown above, in preparation for glass etched cell installation. Clean the solder from the grooves as this is used as your alignment indicators when installing the new cell. Thoroughly clean the brass reticle cell holder with alcohol, clean the lens with eye glass cleaner and dry with a lens cloth. Both pieces must be cleaned thoroughly as it affects the final product.

Step 5 – Cell installation
Mix the Permatex 2 Ton epoxy on a clean, oil and grease-free surface.  Once this is good, let the epoxy cure for at least 2 hours before touching anything.

Step 6 – Assembly
An item to check when the optic is apart is the friction between the erector cell pivot tube and the ball. This is the little tube you can see inside the erector assembly with the lens in it. This should be very free and not bound up. If it is you will get sticky elevation and windage adjustments. Do not get any dust, debris or fingerprints on the lens.

The next step in the process is to thoroughly clean again and inspect the reticle by shining a flashlight through it to ensure no dust or debris is on it. This will show up in the scope, any debris, clean well.

If you live in a very humid climate you can purge the scope prior to installing the eyepiece tube. Stand both the main section of the scope on its objective end and the eyepiece end face down.

Once assembled, look through the optic and confirm the reticle is clean and clear. If it is clean and good to go, unthread the eyepiece tube until the last thread.

Original USMC MST-100 Football Mildot reticle

True Mildot reticle

Congratulations, you are now back in business! Time to go to the range!

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