One of my first buys on there and learned a few things.. In this case I needed to do more research on what I was buying.. This guy sold me a barrel and spring, turns out the barrel never worked (would not extract) the spring was a standard weight spring not what comes with the barrel from the factory.. Barrel and spring are worthless. the only thing that worked was the ammo. Asked him to make it right and he ghosted me.. I did learn something so I guess there is that.