I remember Mattel make single actions that was chambered for brass cartridge case with a spring inside it to propel the grey plastic bullet out the barrel. Had little round stick on caps to put on the cartridge heads.

Also, believe they made a lever carbine as well...

I got my first leason in gun control or how some people don't appreciate fine firearms...

Wore mine ( a brace of 'em) to school (3rd Grade) teacher made me hang 'em in the coat room, till school let out...Gees

Su Amigo,
Dave

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"IN GOD WE TRUST"