Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at


  • TFB Reader

    Two questions. Well, actually three.

    First the simple one: I apparently haven’t stayed up to date, but what’s the purpose of the rounded cutouts in the odd-numbered rail slots?

    Second, which I guess is just a matter of judgment, do the benefits of one-piece uppers outweigh the loss of modularity, locking you into a solution that might not be appropriate in the future? What are you going to do, replace the entire upper?

    • Cornelius Carroll

      To your first question, I think you’re referring to the keymod slots. IIRC, keymod was started by BCM, Noveske, and a bunch of others have signed on. It’s like 1913 but with less weight and, presumably, easier to machine. 1913 is better suited for things like optics, Keymod for grips, lights, etc.

      To your second question, the real benefit of a monolithic upper, IMO, is being able to place optics further forward than normal (if you have a need for that), being able to use BUIS without zero shift (granted other non-monolithic uppers also offer this), and being able to use a laser without the risk of zero shift.

      All of that said, this upper looks b-e-a-u-t-i-f-u-l

      • JumpIf NotZero

        He’s not talking about keymod holes but the notches cut into the top rail. They are there either for weight reduction and/or helping to skirt the LMT patent I think.

        While mounting optics further and surely to be in-line is nice. I’d argue that the real benefits of a monolithic is that it’s far stiffer, can not come apart like a loose rail on a traditional AR, and is TRUELY free float for accuracy as nothing touches the barrel or barrel nut anywhere. The way that most handguards attach to the barrel but is actually sort of stupid considering monolithics and the way some special uppers attach the rails (LaRue, Mega’s other product, etc)

        IMO, this is all better than modularity. If you know what you want, you won’t change the rail.

        And yes, this upper/rail is a work of art.

  • wetcorps

    Megalithic? Is is made of stone? ^^

    • JumpIf NotZero

      They are prohibited from calling it a monolithic like they used to. It’s not their fault you think “lithic” applies to stone.

      The way to skirt the LMT patent on monolithic uppers was to get rid of the claim “continuous top rail” that’s why the bubble level is there. I would imagine also the circle notches in the rail.

      It’s a monolithic, they can’t call it that, their name is Mega… You can probably get the rest.

      • wetcorps

        I was joking, but good to know.