I thought some of you might be interested in seeing some images of a barrel swap for the FN FiveseveN. (I have a threaded barrel for the PS90 on the way.)
This first shot has the two barrels side to side. I was curious to note that the spring rotation is opposite. The weight is exactly the same: 4.0 oz.
This second shot shows a peculiar indentation (where the pen is pointing). Not sure the significance of it:
The barrel is threaded 10 x 1mm RH, shown here without the thread protector:
And then here with the thread protector mounted:
It also comes with a adapter that converts it to a ½ x 28 RH for the Silencerco 22 Sparrow or Spectre II. Here it is unprotected. The knurled part on the barrel is what's used to attach the adapter, and then there's a matching thread protector (that is not shown in this shot, but is included):
Here's the visible part of the barrel, installed:
The barrel comes from EFK Fire Dragon (US Made).