+1-800-504-5897 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

Q&A for CMMG F Marked Front Sight Base Assembly, AR15 — 17 Questions & 17 Answers

Name CMMG F Marked Front Sight Base Assembly, AR15 (3.2)
$75.99 $69.99 Save $6.00
View Product
Write a Review
If you have questions regarding availability, pricing, shipping options for this item or need an answer right now, please contact our customer service team.
Continue As a Guest
Saving...
Sign In or Create an Account (optional)
or Register
Why use an OpticsPlanet.com account for my questions and answers?

Having an account with OpticsPlanet.com makes writing questions and answers even better! We’ll save all of your questions and answers in your account, provide you easy access to them, so you can see how the community has responded.

If you’d like to add a question without creating an account, you can proceed with filling out the fields on this form.

Show
Sort by
Filter by
Q
worldtraveller, guest, from WA, United States, asked on January 27, 2019

is this predrilled for the taper pins to attach to the barrel?

A
Answered by clint, member, from NC, United States, on June 28, 2019

It is not pre-drilled

3 of 3 found the following answer helpful.
Was it helpful to you? Yes | No
Share
View 2 More Answers Submit Your Answer
Q
Tom, member, from WA, United States, asked on September 03, 2024

Can this fsb be mounted with a set screw instead of the mil spec tapered pins? I see a hole above the sling swivel... �

A
Answered by Tom, member, from WA, United States, on October 30, 2025

Thanks! I posted that question over a year ago and have since mounted 2 fsbs using the taper pins. There are a few good videos on YouTube showing exactly how to do it. You could remove the sling loop rivet and tap that hole as well.. that's the hole used to drill the gas hole above it.

1 of 1 found the following answer helpful.
Was it helpful to you? Yes | No
Share
View 1 More Answer Submit Your Answer
Q
Ricky, member, from CA, United States, asked on April 07, 2022

Will This fit FN 20 in barrel?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on May 13, 2022

Yes. The CMMG, Inc F Marked Front Sight Base Assembly will fit any barrel that utilizes a 0.750" gas block.

1 of 1 found the following answer helpful.
Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
Robert, guest, from VA, United States, asked on December 09, 2021

Are there any colors we can change the front sight out with to go with this? Kind of hard to see in dark.thanks

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 17, 2022

Yes. There are many front sight posts that feature tritium that will work with this Front Sight Base Assembly. Some examples include the Blitzkrieg Components AR Spike Front Sight Post, the XS Sight Systems Standard Dot Sight, and Meprolight Tru-Dot Tritium Sights. You can find all these and more using the following link:
https://www.opticsplanet.com/s/tritium-front-sight-post?_iv_categories=ar15-iron-sights,ar15-parts&_iv_gridSize=240

Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
XSA, guest, from CA, United States, asked on November 27, 2021

.750? if not can u provide a link?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 17, 2022

Yes. The CMMG, Inc F Marked Front Sight Base Assembly is 0.750". It will include the front sight post and sling loop.

Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
JD, member, from OH, United States, asked on April 24, 2021

If it isn't pre+drilled ..... Does it come with instructions on how to install it?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on June 24, 2021

Yes, the gas hole is already drilled into the gas block.

0 of 8 found the following answer helpful.
Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
TRIET NGUYEN, guest, from CA, United States, asked on March 28, 2021

Does it fit with M&P15

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on June 24, 2021

Yes it should fit.

Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
ron, member, from TN, United States, asked on October 21, 2020

what barrel dia. does it fit

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on June 24, 2021

AR-15 barrels that are .750" diameter

Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
Z, guest, from WA, United States, asked on May 20, 2020

Will the truglo post fit in these? And is there a tool you need to change it?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on June 24, 2021

Recommend emailing us at techsales@opticsplanet.com to help you further.

Was it helpful to you? Yes | No
Share
Submit Your Answer
Q
TommyGun, member, from NY, United States, asked on January 18, 2020

Is this FSB cast?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on June 24, 2021

Recommend reaching out to manufacturer.

0 of 1 found the following answer helpful.
Was it helpful to you? Yes | No
Share
Submit Your Answer
Last updated 2025-11-12 UTC.