This is a sturdy chamber flag for .223/5.56 rifles. I've used mine for years and have never had any issues and my original prototype is still in rotation. The barrel end allows for greater visibility and grip. Easy in/out.
My original print was with ABS but I've since been printing in PETG. .20 resolution with 50% infill. ABS was nice because I could give it a shine with Acetone but PETG is quicker and easier to work with, your choice, both work excellent. Heck I have PLA flags that are still kicking years later so it's up to you!
Like my design, how about a cup of coffee?
The author marked this model as their own original creation.