This is for airsoft ONLY and cannot be used with a firearm.
This is a barrel extensions for the JTW HCC-2A. It is compatible with the threading built into the muzzle plate. You can download the HCC-2A here: https://www.thingiverse.com/thing:3712294
It prints in two pieces, allowing the end user to fill the barrel extension with support material to prevent an oversized barrel from misalignment with the bore. The two components can later be glued together using a chemical bonding adhesive.
This is NOT compatible with standard airsoft toys. It is ONLY compatible with the HCC-2A.
This print has been tested and is compatible with the HCC-2A muzzle plate. However, a word of caution:
When you install the barrel extension for the first time, thread it in SLOWLY. This allows the threads to cut the excess material off of each other, which happens the first time you thread any two 3D printed parts into each other. Then, the MOMENT you hit resistance toward the end of screwing it in, STOP. Otherwise you will tear the threads out of the muzzle plate, if your muzzle plate was printed out of PLA.