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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 $63.89 Save 16%
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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

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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 dannyo66, member, from ND, United States, on October 30, 2025

Hi Tom. I just bought the sight too, haven't installed it yet. I see the hole is in the rear part of the sight for tightening it but it isn't tapped for the set screw. I aligned the sight and it does appear to line up fairly well with the little hole cut in my barrel so I'm suspecting it will work. The problem I see is that the sling swivel is in the way and I can't seem to figure out how to make it fit without removing the sling swivel. I also see the hole isn't tapped for the screw so it will have to be tapped. I also saw another individual had drilled a hole through the bayonet lug and attached a 2nd screw through that hole. He said it made for a really solid mount. I'd be interested in doing this same thing with mine, but I don't have the ability to do this, so I might just have a local gunsmith do this for me. Seems kind of complicated to get it to work.
I believe it's doable but a bit out of my technical abilities.

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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.

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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

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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.

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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.

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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.

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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

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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.

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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.

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