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HBM-23.5 - Reliability Mods for the HBM-23 — zdjęcie 1
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HBM-23.5 - Reliability Mods for the HBM-23

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These files contain all the mods I made to my HBM-23 to make it reliably dump 40 round box mags.

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Printables
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Creative Commons — Attribution — Noncommercial

The HBM-23 is a great blaster but I really had a hard time getting it to fire reliably. After doing a bunch of troubleshooting, I've made a number of modifications to mine to make it shoot much better. There's been a number of changes but the major ones that affect reliability are:

  • Lengthening the breech to accommodate longer links in order to use links that fully cover the rubber tips of darts. This single change required remodeling a significant portion of the blaster
  • Removing the back wall from the roof and lengthening the dart pusher in order to utilize the dampening washer of the solenoid
  • Adding an access port to the sprocket holder in order to tighten the sprocket grub screw

Note that everything was designed to be used with the bill-of-materials that the original HBM-23 used. The ONLY exception is that the box mag needs two M2 screws ~10mm in length… this is the attach the lever to the box mag.