Front Sight Base F - FSB (ID .750) - Milspec for Flat Top Uppers

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Stock Status:
The "F" marked forged front sight base is a hard product to find. Mil-Spec for rifles issued to the troops require taller front sight bases on all flat top AR rifles. (.750")
Designed to match the height of Mil-Spec height rear iron sights.
These are new and are not yet drilled for taper pins, and should be installed by a qualified gunsmith.
This includes front sight base only. (Not included are front sight post assembly, sling swivel assembly, and taper pins.)
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit***

35 Reviews

  • 4
    Worth the purchase! You need it? Buy it.

    Posted by Dan O’Neill on Feb 24th 2021

    The sight fits well, as needed, and has a little weight to it, so it seems sturdy. I also like that there is a roughness to the ramp and verticals. This should prevent glare and provide “toothing” for the paint if I decide to camo this rifle.

    I am very pleased.

  • 5
    M16A4 Clone Project

    Posted by Bill Bakopoulos on Feb 19th 2021

    Picked this A2 FSB up for a M16A4 clone that I'm putting together. Just got it finished a few days ago and everything turned out great. My build was a National Match style build so I had to cut off the sling swivel mount and blue it since the national match free float tube has a sling mount included. The front sight post again was a national match style thinner blade. Everything came together nicely and BCM always delivers.

  • 5
    Excellent piece

    Posted by Randall Tyrer on Jan 31st 2021

    Perfect fit for my build

  • 5

    Posted by Azntactical on Jan 28th 2021

    Bought a few of these for builds. Worked out well.

  • 4
    A2 front sight base

    Posted by Ben on Jan 19th 2021

    The FSB is top notch, just be aware of some things though. First it does not come with the taper pins or the front sight pin assembly, these will need to be ordered separately. Additionally as you can see in the picture, the pin holes are not drilled, some gunsmiths don't want to mess with a FSB without the holes drilled so check with your smith first if you're not doing the work yourself.

  • 4
    Great Quality FSP

    Posted by Mason Hamilton on Jan 7th 2021

    Nice, heavy duty front sight post, came slightly oiled for rust protection (i assume). Wish it came with front sight installed considering its only a few more dollars that i’d gladly pay to not have to order it separately

  • 5

    Posted by C.Xiong on Dec 29th 2020

    Fit and finish is good. Hard to find these online atm. Nothing special about it.

  • 3
    Front sight base f-fsb I’d (.750)

    Posted by John Aquino on Dec 28th 2020

    Great item no front sight posts no thread for the front sight base and set screw

  • 5
    Great quality

    Posted by Michael Thacker on Dec 6th 2020

    This is absolutely as expected. Shipping was great and they always throw in swag which is awesome as well. Who don't love stickers. Will be ordering again.