Algodoo

This AK-47 Can be field stripped, fired on Semi and auto, loaded and unloaded, and is gas-operated.
To use: load magazine, cycle action, select firing mode (up is safe, middle is auto, down is semi), fire with enter or by dragging trigger.

To field strip: Push in the tab at the back of the upper receiver, lift and pull receiver away, remove recoil spring by dragging forward, then up, and then back, and finally remove bolt and bolt carrier. To reassemble, reverse the process

Edits: Improved magazine, bolt group, gas piston, and field strip. it is easier to field strip and reassemble again.