autoloader has definitions from the field of arms
1
[ noun ] (arms) a firearm that reloads itself

Synonyms

self-loader

Used in print

(Sports Age, 24:9...)

The American firearms and ammunition manufacturers through diligent research and technical development have replaced the muzzle_loader and slow firing single shot arms with modern fast firing autoloaders , extremely accurate bolt , lever , and slide_action firearms .

*