NERF barrel extension (#1) -- basic design

This is a basic design for a NERF barrel extension. There is a ring mount that lets you connect it to some NERF weapons and a barrel with a simple iron sight on the end. The added length may increase the accuracy of your shots.
I plan on making several more designs with various greebles on them and even useful features (like rails).
As of this upload, I have ONLY printed "nerf-barrel_extension1-test1.stl" on my MakerSpace's KosselKlear Delta Printer at 330% speed for a rough test fitting.
It is important to note that the bottom portion of this test barrel did NOT fit into my NERF Rayven blaster with out significant trimming.
In the other models, I trimmed 0.5mm from the lowest portion of the barrel, but they has NOT been printed or tested. Use care and do not force!
The 165mm length barrel is the maximum height that will print in an 8 inch vertical printer while the 147mm length barrel prints in a 6 inch vertical.