Vendi Airsoft does a short explanation of the mods done to the WE Airsoft G17 Gas Blowback Pistol... "Just a quick test firing of my custom WE G17. The pistol features a hand stippled grip, with a custom top slide. Internally, the barrel has been upgraded to a crazy jet maple leaf tight bore barrel, with a maple leaf hop up.
It also features a Cowcow recoil rod and spring, which has also been short stroked."