When the front of the barrel is made with a clear material, you’ll be able to see the section threads through it. This is just something you should be aware of.
Cart Converter examples:
Front 1/2 inch of barrel
Front 2/3rds of barrel
1/2 inch wide, about 1/3rd up barrel
The whole barrel
Piston Filler examples:
Hidden under cap when pen is closed:
Another example of ink window hidden under cap:
Where a sliver of the window is visible when the pen is closed:
Entire barrel is clear:
Front half or so of barrel is clear:
