Hmmm, kinda defeat the purpose of a Semi auto. that would be a useless feature for me. if whatever you are shooting at doesn't go down on first shot you have to unlock it and pull slide back. that would be a NOPE from me.
It does seem a bit expensive, the glock is around 700 bucks. it don't tell what sight that is on it. the locked button on the slide is for what? It also says manufacture B&T. they certainly didn't make the gun and doubt they did the can or sight. just put their name on it.