Originally Posted by Whiskeydan

The one I have is a spring piston type. Breaking over to load compresses the spring.
It was a kit .177 cal gun that I bought about thirty yrs ago and is still very accurate although, hell on scopes due to the double recoil. I found a Simmons scope I am pleased with.

The .177s are cheap fun, the .22 cal is loud, more expensive to shoot.