Click on the gun to shoot it. Press L to activate the laser sight. Press K to deactivate it.
I found this BB gun I want to buy, but I can't yet so in the meantime I made this project to simulate it. The gun is a Sig Sauer 1911 handgun. Laser sounds from Half-Life: Opposing Force. If you want to buy the gun yourself: https://www.replicaairguns.ca/cybergun-sig-sauer-gsr-1911-bb-pistol-4-5mm-co2 And for Americans who want to buy it from the American store, it's unfortunately unavailable. But here's a similar gun (a P226): http://www.replicaairguns.com/buy-air-blank-guns-us/#!/Cybergun-Sig-Sauer-X-Five-P226-Open-Version/p/9331025/category=2215357