That's right. Drop in American made barrel for a Colt 25ACP vest pocket with a 1/2-28 threaded end, with thread protector.
Regularly priced from manufacturer at $200.
Yours for $160, shipped.
I had it on a 1920's model and it works fine. Frankly the gun shot better with it. The extra length may get you an extra 1.57 fps from your reloads.....