Jesus, you guys are way overcomplicating this.
An 07/sot can manufacture suppressors, replacement parts ie, recore a suppressor, replace endcaps, etc. A suppressor can be shortened for repair purposes, but not generally more than about 1/4". This is not defined, but is the accepted norm. Even an 07 cannot legally replace a tube by making another identical one and numbering it the same.
As an f1 builder, you are not an 07, so you cannot legally do any of the above things.
It is not legal to:
Experiment by making extra baffles, bafflestacks, etc.
Make extra endcaps to fit different weapons.
Lengthen the suppressor.
Replace any damaged parts, or parts deemed not effective.
Replace the tube.
You can make your suppressor shorter than the length specified on the f1. Simply send a letter to nfa branch telling them that you made it shorter, and what the length actually is. They will amend the registry.
If you make an oil filter suppressor, you cannot legally replace the filter.
The 07s who make these are required to number the filter to the adapter. When you send it in to be replaced, they put the same sized new filter on it, and number it the same. This has been approved by atf as a "recore". Therefore, only an 07 can legally do this.
If you do this, you are committing a felony. Thinking that atf can never know is bs. It is common knowledge that these don't last all that long when used on centerfire calibers. So, when your "like new" filter is seen on the well worn adapter you papered 5yrs ago, they know it's been replaced.
This is why the f1 oil filter is mostly a waste of time and money. Even buying one is a waste, as after you've paid the recore fee several times, you've bought a low end suppressor that would still be running.
You can make modifications to the baffles you made, such as porting, "clipping", etc.
The whole "nobody will know, so it doesn't matter" thing does not change that one is committing a crime. And you might be surprised at the ways that you can be caught, accidently, by something you didn't think of.
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NRA Life, SASS#40701, Glock Advanced Armorer
Gunsmith for Unique Armament Creations LLC, 07/SOT
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