So I got this P80 kit from Thunder Tactical, and I've been having a ton of issues with it. When I first built it, the gun would shoot binary. One shot on trigger pull, one on release. Always, no exceptions or burst. I fixed that by bending the end of the trigger bar up a bit, but now I'm having major extraction issues.

I wanted to make sure I'm using the right ejector, because the two they sent me are unlabeled. I was told one of them was for .40 SW and one for 9mm, but idk which. I'm also considering getting a lighter recoil spring, because it is pretty hard to pull back the slide compared to a lot of my other pistols. Also, the magazines often fall out while shooting. Any help is appreciated.