+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3 F1-OPT-LOWER1/3 Color: Black, Finish: Anodized, $4.50 Off w/ Free S&H

Special offer available for this product. Click here to see!
Limited Time Offer. Click here to see!
OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount, Lower 1/3 Co-Witness, OP Tan, Small, F1-OPT-LOWER1/3-OP
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount, Lower 1/3 Co-Witness, OP Tan, Small, F1-OPT-LOWER1/3-OP
1 of 14 images
OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount, Lower 1/3 Co-Witness, OP Tan, Small, F1-OPT-LOWER1/3-OP
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
2 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
3 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
4 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
5 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
6 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
7 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
8 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
9 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
10 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
11 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
12 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
13 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3
14 of 14 images
Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3

Tap Tap to Zoom

Questions & Answers
Will this work with a sightmark mini shot? Expert Answer

The OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount is for red dots that use the Aimpoint Micro footprint. The Sightmark Mini Shot series red dots come with different footprints depending on the model you are talking about. The Sightmark Mini Shot M-Spec and Pro-Spec use the Docter/Noblex footprint. The Sightmark Mini Shot A-Spec uses the Shield footprint. None of these models will work with the OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount.

by Hunter, Gear Expert, October 12, 2022
Will this work for a Sig Romeo 7s or Primary Arms SLx 3x micro magnifier? Im using both and would like to try using this mount for both.... Expert Answer

The OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount works with red dots using the Aimpoint Micro mounting footprint. The Sig Romeo 7 does not use that mounting footprint and will not work on this mount. The Primary Arms The SLx 3x21mm Micro Magnifier uses a 30mm ring or ring mount and will not fit the OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount either. We don't have an aftermarket mount to fit the Sig Romeo7 but the mount at the link below will work with the Primary Arms Magnifier.
https://www.opticsplanet.com/primary-arms-primary-arms-flip-to-side-magnifier-mount-standard-height.html

by Hunter, Gear Expert, August 19, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
works well and look purty by Ryan Spear, Verified Owner, March 30, 2024
Looks soo much nicer than the Sig Romeo 5 mount. Matches the style of my fortis grip and hand stop
1/1 found this helpful
Helpful Positive Review
excellent mount by nate, Verified Owner, November 20, 2018
I prefer fixed mounts over Quick Detach, this one is great. perfect lower 1/3 mount that is light weight and durable with excellent machining. i will be replacing all my red dot mounts with these over time.
3/3 found this helpful
Most Recent Reviews
AWESOME MOUNT by pelxcr, Verified Owner, May 28, 2026
This is my third mount, great look, light robust design.
Most Recent Reviews
its a mount by Ryan Spear, Verified Owner, March 23, 2024
Does everything it’s supposed to do! Holds my AR to my SIG Romeo 5 perfectly! Looks much better than the stock SIG mount
Most Recent Reviews
Helps with eye relief by Sore back, Verified Owner, January 16, 2024
Bought this to replace the mount that comes with the Vortex Spitfire II 5x prism scope. Needed to move the scope closer towards the stock for better eye relief. This helps but I wish it was even more of a setback. Still cannot extend my stock back...
Read More...
Most Recent Reviews
Closer to Full Co-Witness with a 1.5 inch height center line by Jim, Verified Owner, September 15, 2023
These look and work amazing. Hold zero and well made. Great product for the price point in terms of durability and finish. I just wish they were a little taller at 1.93 like my EOtech Sights and Magnifiers. Still a great product. Just be aware w...
Read More...
Read All 6 Reviews
Color:
Black
Red Dot Sights-Footprint:
Not Applicable
Attachment Type:
Picatinny
Optic Cut:
Not Applicable
Condition:
New

Code: 2GN-RMT-FTMOMO-1-F1-OPT-LOWER1-3

MPN: F1-OPT-LOWER1/3

UPC: 810103344136

List: $89.95Save $4.50
$85.45

Product Info for OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3

This sturdy OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3 is the perfect platform for your favorite sights and is compatible with a wide variety of optics. Fortis Manufacturing crafted these Red Dot Sight Mounts from Type III hard coat anodized aluminum for a lightweight, durable and corrosion-resistant structure. Each OpticsPlanet Exclusive Fortis Manufacturing F1TM Red Dot Sight Mount - Lower 1/3 mounts to any Mil-Spec 1913 Picatinny rail, and the innovative design extends your sight forward, allowing for quicker target acquisition in the field or at the range. Upgrade your weapon build by attaching an optic with this OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower Third.image

Specifications for OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3:

Manufacturer: Fortis Manufacturing
Color: Black
Finish: Anodized
Fabric/Material: Aircraft Grade 6061-T6 Aluminum
Red Dot Sights-Footprint: Not Applicable
Attachment Type: Picatinny
Optic Cut: Not Applicable
Weight: 1.3 oz
Condition: New

Features of OpticsPlanet Exclusive Fortis Manufacturing F1 Optics Mount - Absolute Co-Witness:

  • Available exclusively from OpticsPlanet
  • One Piece Billet Design
  • Slotted Screws Attachment
  • Aircraft Grade 6061-T6 Aluminum
  • Military Specification Type III Hard Coat Anodized
  • Logo on both sides
  • Lightweight 1.3oz
  • Absolute Co-Witness
  • Aimpoint Micro T-2, H-2, T-1, H-1, & Aimpoint CompM5, Vortex Crossfire & Sparc II, Sig ROMEO4 (H/S/T) & ROMEO5, Primary Arms Micro, Holosun Micro
  • Blue threadlock
  • Will work in conjunction with 3x magnifiers

Package Contents:

  • OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3
  • blue threadlock

OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3 Orderable Models

List of Orderable Models

  • Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3 , MPN: F1-OPT-LOWER1/3 , UPC: 810103344136 , Code: 2GN-RMT-FTMOMO-1-F1-OPT-LOWER1-3

OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount - Lower 1/3 Unavailable & Discontinued Models

List of Unorderable Models

  • USED Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3, EDEMO1, Used, Condition Fair , MPN: F1-OPT-LOWER1/3-EDEMO1 , Code: 2GN-RMT-FTMOMO-1-F1-OPT-LOWER1-3-EDEMO1
  • Open Box, Dealer Demo, Fortis Manufacturing F1TM Optics Mount - Lower 1/3, Black F1-OPT-LOWER1/3 , MPN: F1-OPT-LOWER1/3-DMO , Code: 2GN-RMT-FTMOMO-1-F1-OPT-LOWER1-3-DMO
  • OpticsPlanet Exclusive Fortis Manufacturing F1TM Optics Mount, Lower 1/3 Co-Witness, OP Tan, Small, F1-OPT-LOWER1/3-OP , MPN: F1-OPT-LOWER1/3-OP , Code: 2GN-RMT-FTMOMO-1-F1-OPT-LOWER1-3-OP
Compare (0)
1 item has been added
Add at least two items to compare
Last updated 2026-07-07 UTC.