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I heard from a few people that they were having trouble threading their inserts into the FTN.5

After troubleshooting, this seems to be a print issue. Upright prints threaded fine, but the sideways tilted prints had some very small dimensional changes from warping that caused trouble threading the adapter.

This pack has some looser tolerance threads, in case you have trouble with the original pack.

A couple tips:

-If you do the shell reinforcement first, the print wont crack because it will already be reinforced

-the easiest way to install the insert is to place the flats of the insert in a vise, and then screw the suppressor body onto it with your hands

The original FTN.5 release file has also been updated to include this pack, along with fixing a typo regarding the measurements of the rimfire form 1 sections. If you are doing a form 1 rimfire, make sure you look at the corrected measurements when ordering your tube