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Thread: Cutting handguard

  1. #1
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    Cutting handguard

    Has anyone expended the effort to modify a free float handguard (ie, Centurion or ALG are my go-to) by cutting back the front or cutting out a space from the top for a FSB? Additionally, would there be concerns about the structural integrity of the handguard afterward?

    I thought I’d seen this done by someone before. I understand it is not necessary. However, I really like FSB’s and would like to utilize them with longer slim, free float MLOK/Keymod handguards.
    “God doesn’t need your good works, but your neighbor does.” - Luther

    Quote Originally Posted by 1168
    7.5” is the Ed Hardy of barrel lengths.

  2. #2
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    Years ago I had a buddy notch out a cheap YHM FF tube for a 16" carbine with the FSB.

    It was a range toy so I never abused it or used it for anything tough so I can't comment or durability, the biggest problem that I completely overlooked before starting was how much of a PITA it would be to reinstall the FSB pins. Holes had to be cut in the rail for punch access and I would likely not do it again. Sorry I couldn't answer your durability question but figured it was worth mentioning the FSB pins in-case, like me, you overlooked it.

    I want to say someone here did it to a Fortis handguard and I vaguely remember an ALG but that might've been on another site.

  3. #3
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    The only thing I can think of on cutting it behind the fsb is if the cut ends up in the middle of a slot it would screw up the forward most mount slot and might be something of a snagging issue.

  4. #4
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    Quote Originally Posted by bb223 View Post
    Years ago I had a buddy notch out a cheap YHM FF tube for a 16" carbine with the FSB.

    It was a range toy so I never abused it or used it for anything tough so I can't comment or durability, the biggest problem that I completely overlooked before starting was how much of a PITA it would be to reinstall the FSB pins. Holes had to be cut in the rail for punch access and I would likely not do it again. Sorry I couldn't answer your durability question but figured it was worth mentioning the FSB pins in-case, like me, you overlooked it.

    I want to say someone here did it to a Fortis handguard and I vaguely remember an ALG but that might've been on another site.
    i actually did this for a friend with a yhm rail








    i'm notching out the rail on my leonidas to accommodate a switchblock at the moment. i now know why noveske went with a split rail on their switchblock rifles. making the switchblock work on a one piece free float rail was a bit of a challenge.

  5. #5
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    Quote Originally Posted by the_1iviper View Post


    Beautiful. What did you use to cut it out? I
    “God doesn’t need your good works, but your neighbor does.” - Luther

    Quote Originally Posted by 1168
    7.5” is the Ed Hardy of barrel lengths.

  6. #6
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    I have cut off an Aero hand guard and one Geissele, but not for use with a FSB. I just wanted a length in between what is manufactured. I've had no problems.

  7. #7
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    ALG EMR V1 MLOK

    6B962230-4745-4C5F-8CD8-817B797919C6.jpg

    BCM 12.5” Kino

    76790435-D8A8-47C8-9B3A-757F0A257D2B.jpg

    I’m not a machinist... But it looks like it would be simple enough to cut back the 10” rail to fit my upper.
    Or, judging by what is shown on the YHM, it should be possible to cut out a section of of the 12” EMR V2:

    2898D34B-D109-460E-B513-8C91E1DD9216.jpg
    Last edited by JediGuy; 12-01-18 at 23:24.
    “God doesn’t need your good works, but your neighbor does.” - Luther

    Quote Originally Posted by 1168
    7.5” is the Ed Hardy of barrel lengths.

  8. #8
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    V0 is dirt cheap right now and has the least amount of slots milled into it.

    Maybe a good option to try?

    The EMRs are small inside diameter though, might have to chop off the bayo lug and sling stud ears.

  9. #9
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    I've kept an thread on this exact topic bookmarked for quite some time:

    https://www.m4carbine.net/showthread...g-up-some-NSRs
    -Colt 6920 w/Aimpoint PRO

  10. #10
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    I have personally modified 2 KAC URX4 MLOK rails, ill post pics later, I haven't had any problems. I machined the MLOK groves longer on both to secure gas block and I cut a 13 rail down to 10.75".

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