Boost the range and accuracy of your Marui GBBR

UPDATE 06/04/2022: Now In Stock!

Our SixG SUPER NUB is the best bang for buck upgrade available for the MWS range.


This precision machined nub is a drop-in upgrade for TM’s GBBR range.

Expect increased range, tighter groupings and better shot consistency.

In standard form the hop unit struggles to lift more than 0.28g BBs and although the performance of these RIFs is excellent out-of-the-box, big gains in range and accuracy can be had from this upgrade part.

This nub allows you to use much heavier weight BBs which is another great upgrade for this range of RIFs, being best suited to field work where their distanced shooting ability can really shine. See below for recommended BB weights.

Which bucking should I use with the SixG SUPER NUB? UPDATED 09/09/21

We have thoroughly tested this nub in conjunction with a large range of aftermarket buckings, but to date the best results have come from a standard TM bucking.

We no longer recommend the Modify Tan due to wildly varying QC and lately they have very short lifespans.

However we have been getting good results with the Maple MR buckings, please note that these are not drop in, the locating tab needs trimming down with a craft knife / scalpel.

  • <370 FPS use 50d
  • >370 FPS use 60d

All other buckings tested to date – Sept 2021 – are a downgrade and will reduce the accuracy and consistency of the MWS.

Please note access to the hop unit is a little involved on the MWS, requiring the whole outer barrel assembly to be removed from the upper receiver to allow fitment of the nub.

TM GBBR suggested BB weight VS feet per second

  • 300 FPS / 0.28g
  • 325 FPS / 0.32g
  • 350 FPS / 0.36g
  • 375 FPS / 0.40g
  • 400 FPS / 0.43g
  • 400+ / 0.48g

To fit the following models;

  • M4A1 MWS
  • M4A1 Carbine
  • MTR16
  • MK18 – Special tool requred for handguard removal!

HOW TO PURCHASE: SixG SUPER NUB £16.50 including UK mainland delivery.

We have now teamed up with airsoft store Leadfoot SixG as an official stock holder to allow you an easier order process and the opportunity to order other relevant items for the MWS, so please click the link to visit them and place your order!

If you have any technical queries or wish to order directly then please email us with your order, we will require your full name and delivery address confirmation, overseas orders will also need an email address.

19 thoughts on “SixG SUPER NUB for Marui GBBR

  1. Love mine! Best mws buy for the money

    Liked by 1 person

  2. James simpson Jul 9, 2018 — 12:08 pm

    Best upgrade you can buy for the mws for such a small price.
    Top quality product must buy for any mws owner.

    Liked by 1 person

  3. Easily the best value for money upgrade for the MWS/MTR platform, thanks Dave – John R


  4. So the quailty of of the finish is impeccable, it fits perfectly. It’s ability to hop BB’s is amazing. When people state that this is the best accuracy upgrade for the mws platform they are 100% correct.
    Thank you SixG!!


  5. Been testing mine for a bit on a fairly stock gun and I’ve noticed a Substantial increase in accuracy.


  6. Are they still around, have been contacting them but they arent responding


    1. Hello Joe, yes we are still up and running.
      As an enthusiast venture please allow more than 3 days for a response, especially over a weekend!
      Regards, Dave@SixG


  7. Hello, I have sent an email about a week and a half ago and received no reply. Please advise what I should do next. Thanks


    1. Hello, apologies for closure of late, we are however now back up and running at full steam. Best, Dave@SixG


  8. Dave‘s nub is the one „end to all upgrades“ if you’re a mws owner or plan on purchasing one. If you’re planning on using bb‘s heavier than 0,28 (which imho is the only way of unfolding the mws‘ true potential), get the nub, leave EVERYTHING else the way it is. Makes the fairly hefty investment of buying a gbbr (mags ect) the cheapest gun you ever owned in the long run.
    Using 0,32s and asg ultrair gas, the mws hits man sized targets out to 70m with a near flat trajectory.
    Great to have enthusiasts that provide those hand made smart products as a support to the community.
    Keep on smithing!

    Liked by 1 person

  9. Please let me know when you restock – also I read about the other bucking beings a downgrade paired with your nub.. atm I am using the PDI w hold and getting fairly good results would you advise to switch?


    1. We have faced a few hurdles recently but hope to be back with full stock in the not too distant future, new performance and maintenance products for the hardcore MWS users!
      I am a fan of the W Hold, but not in the MWS, i find it becomes deformed when fitted into the MWS hop unit as it is too large, this also creates nozzle sealing/binding problems.
      Regards, Dave@SixG


  10. Any word on the restock? Really looking forward to getting these and a few other bits.


    1. Hello, Yes we will be despatching new orders early this month, thank you all for your patience!


  11. New to the gbbr platform and just got myself a MWS. Heard good things about your brass nub! How do I officially place an order?


    1. Looks like you found the link 🙂


  12. I installed the nub and the HSB, and my MWS is getting more range then ever.

    Before, ,30 with greengas, the MWS have difficulties whith lifting these, afterwards, it could lift even more heavy bb’s.



  13. Hello Dave,

    I bought two of your nubs few weeks ago.
    One is in my stock MWS upper and I’d like to build another Upper receiver.
    Have you ever used it with PDI 6.01mm barrel built for MWS specifically?
    Which barrel do you recommand if stock barrel is not in disposition?


    1. Hello, thanks for using the Super Nub!
      I have not specifically used the PDI 6.01 with the MWS, that said in vast other testing performed by myself i find anything tighter than 6.03 to be detrimental to performance, especially with rifle length barrels, the margine for error and/or dirt contamination is too small.
      Assuming you are looking to build a DMR upper or such like, i would use a Prommy 370mm 6.03 (which is drop in) or equivalent, just make sure the hop window is big enough!
      Regards Dave@SixG


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