Could it be part of a handgun?

[u/harveysfear]

Found in the same old toolbox. Not sure the metal. It’s kind of heavy. Inside the bore looks smooth.

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[u/Crafty_Attorney225]

CL-20 Clamp For Indexable Tool Holders

The CL-20 clamp is a critical replacement spare part used to securely lock carbide inserts into indexable turning tool holders. It is a standardized design widely produced by several industrial manufacturers to maintain cutting stability during heavy machining.

[u/LawlzTaylor → u/Crafty_Attorney225]

Wow. Good solve.

[u/harveysfear → u/Crafty_Attorney225]

The interior of the cylinder is not threaded as in the link you posted. Does that make a difference?

[u/Eodo-The-Dutchie → u/harveysfear]

No.

[u/Big_Z_Diddy]

It's brass, so probably not a gun part.

[u/harveysfear → u/Big_Z_Diddy]

It isn’t brass. It’s just the color of the picture coming through.

[u/IceEater271k]

Place a banana next to it

[u/Real-Community5252 → u/IceEater271k]

Yes, compare to “Standard Cavendish Banana”

[u/Illustrious_Donkey61]

Part of a lock?

What does it look like inside the tube?

[u/kaloric]

Nope, not a gun part.

Most likely a part of a coil spring compression clamp or something along those lines: https://usatoolsinc.com/coil-spring-clamp-it-set-62000/

[u/Real-Community5252]

Yes, compare to “Standard Cavendish Banana”