Educate me. What is it.

[2nd Amendment]

I was at a gun show back in the Midwest last fall, and I bought a box full of stuff. Bullets, brass and other items I'll probably never use.
I finally got around to sorting through it and this was in the bottom.
It's 11.5 CM long. (Little over 4 1/2") and 6 mm (1/4") in diameter.
Rounded on both ends. Knurled in the middle. Steel, blued and shows no signs of wear.
Any ideas?

View attachment 1851796

View attachment 1851797

Have no idea what it is, but Val 1884 may be right:

It is similar, but longer than these center knurled dowel pins:

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

or these knurled pins:

Knurled Pins Manufacturer - Hartford Technologies

We manufacture precision knurled pins and studs that provide the highest levels of straightness, roundness, and hardness for use in industries worldwide.

hartfordtechnologies.com