Outside lock ball reservoir CO2 Air Rifle

Outside lock ball reservoir CO2.

With thanks to Mike for permission to re-post these pics. He says it is a 30 bore taploader CO2. It was originally 40 bore but "downsizing it made for better performance" and "gets around 16 shots at 575-620 [fps] on a good day".

These are pics of a 45 cal. pistol to show the lock mechanism:

Mike says of this pistol:

"I made this last year, 45 cal...just finished a tap loader conversion on a 30 cal barrel...
It’s big....21” with 10.5” barrel"