The “hassle” is up to you. This question has been asked a lot on here.
It’s all about mission and what you want. There is little velocity gain for practical distance from 14.5-16.
If there was no NFA, what length would you make it?
I find pinning a 14.5 worth it because I pin it with the suppressor mount. I find an SBR lower is worth it for a 12.5 and under. A 16” with a suppressor Mount muzzle device could push it out to 18”. Now you have an SPR.
. Add a can and you are ready for a pole vault. So take whatever “hassle” you are willing to have and enjoy.
One thing for certain, I would not SBR a lower for a 14.5 upper for multiple reasons.
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