OV-10 "Bronco" by UFOHORNET™

The North American Rockwell OV-10 Bronco is an American twin-turboprop light attack and observation aircraft. It was developed in the 1960s as a special aircraft for counter-insurgency combat, and one of its primary missions was as a forward air control aircraft. 

This aircraft has a semi-detailed Cockpit with Gunsight for both Pilot and Copilot it also has a payload of 2 500lbs bombs Zuni ASRs and 6 12.7 Machineguns instead of 7.62mm machine guns (they fit better and work just about the same)
(Controls) Left CTRL changing flight control from keyboard to mouse controls SHIFT to DROP bombs Mouse 1 for Machineguns Mouse 2 for Zuni ASRsLEFT ALT for Aim9 AAMsSpace for Reload of all ordnance REQUIRES FIN2 ACF SPROPS AND WIREMOD

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

  • steamapps
    • common
      • garrysmod
        • garrysmod
          • addons
            • <-- Addon folder!
              • e.g.
              • lua
              • maps
              • materials
              • models
              • etc

Don't know where the Garry's Mod folder is or how to extract zip files? See more useful installation tips.