Matrix 40mm M203 Grenade Launcher for M4 M16 Series Airsoft Rifles (Model: Short Type / Desert)

"Looks amazing, comes with a few different adapters for different mounting styles which is cool, but... it has a short firing pin that doesn't quite push the release button on my grenade and it doesn't fire at all. I figured if I got the same brand grenade as the launcher it would work, but nope, total dud sadly. I'll be looking into ways to mod it,I guess. I'm sure if I returned it, they would say nothing is wrong with it so I'll just figure it out with some help from YouTube