Taper aligns fit then tap with hammer or whatever to seat in spent casing. Using spent casings protects firing pin better and easily replaced. Getting 6-12 dry firings before they get a bit messy.
With full full size shape magazine can be fully loaded and used.
Since there maybe variation between ammo you can scale print or adjust step file.
If your short spent casings your not out enough.
Printed on end with brim. Not sure if I used 2 or 3 walls. If it can't take your beating add a wall or lighten up.
The author remixed this model.
Taper aligns fit then tap with hammer or whatever to seat in spent casing. Using spent casings protects firing pin better and easily replaced. Getting 6-12 dry firings before they get a bit messy.
With full full size shape magazine can be fully loaded and used.
Since there maybe variation between ammo you can scale print or adjust step file.