Why would these be a hassle if empty and no gun? No different than taking a fancy cell phone carry device or similar
Anything that can be described as a 'firearm part' is verboten from long before TSA.
A spare 1911 hammer is not allowed.
A rifle bolt is not allowed.
A rifle scope is not allowed.
You might get a spotting scope through by playing dumb and saying it is for bird watching.
Some airports are smart enough to have a mailing services booth adjacent to the lines.
At least a few of the booths provide next day service.
Pay $$.
You have to decide how much the object is worth and how bad you want to bring it.
Some things it is just as easy to send to yourself next day care of the hotel, or just purchase new items to be delivered to you next day at the hotel.
I have spent many hours and days at cyclotrons measuring the response of semiconductors and material to space radiation.
It is far easier to have things sent to a Hampton Inn that to quickly get them through receiving at a large cyclotron facility.
Now it must be sent CO a cyclotron employee so receiving knows who it should be delivered to.
The front desk at the hotel will call me if set up ahead of time and I can just drive over and pick it up from the desk.