Algodoo

Modify this gun anyway you like it, and upload your work as a response to this scene.
There are some ready parts, but you can also create your own ones. Rifle is inspired by HK-G3.

To shoot:
1. Pull the mag in.
2. Cock the weapon using cocking handle (its possible to lock it in rearmost position).
3. Turn the safety off (lever above the trigger).
4. Pull the trigger (semi-auto only).
5. If the mag is empty, remove it just by pulling it out.

Weapon uses SR25 mechanism, so its very reliable.
To use the custom parts:
1. Delete big blue fixates on them.
2. Remove original parts from the rifle by deleting big gray fixates. (stocks, handgrips, handguards, sound supressors/flash hiders)
3. Fixate your custom parts to the rifle.
To make weapon movable, delete big blue fixate on the handguard.
Have Phun.