G17 G18 GBB TDC outer barrel assembly TM, WE,

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Allows external adjustment of the G17/G18 Hop up. With good quality rubber, use 0.3 to 0.5g bb.

We took the expertise and knowledge from the design and manufacture of the Mk23 TDC series, and applied this to the Glock G17 and 18. This gave numerous engineering challenges. After 18 months of testing and changes, development and feedback. We have a game changer.


Remove slide, remove existing outer barrel assembly. Open hop unit barrel assembly, and remove the hop wheel.

Re-assemble with a quality bucking, Flamingo or ML Autobot 50 series. ML Crazy jet barrels work exceptionally well in the setup.

Insert an H-plate or Fang if required (ideally use for 0.4 and above)

Rebuild, and  when fitting the HAD outer assembly, ensure to nip up the lower securing grub screw. DO NOT OVER TIGHTEN.

Once the inner/outer are replaced in the upper slide, add the grub screw to the TDC.

Refit the upper to the lower, and check slide to TDC grub clearance.


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  • 5
    Game changer

    Posted by Adam Ball on 3rd Jul 2020

    This barrel is fantastic, a complete game changer. After using the MK23 tdc I was incredibly excited to try one for my Glock and it certainly doesn't disappoint. I will be recommending one to all my friends.

  • 5
    G17 G18 TDC outerbarrel assembly

    Posted by Brewsky666 on 5th Aug 2019

    Easy install on my TM 18C. Insane range and accuracy together with ML hopup chamber, grazyjet and Flamingo bucking. Same results like my Hadron upgraded TM MK23. I highly recommend this product.