I must admit, my S400 feels to be better build quality, and handles better than my Falcon FN19.

But as far as accuracy is concerned my Falcon is marginaly better.
I got it out the other day, had a plinking session with it, and spent the rest of the day wondering why I hadn't used it for so long.
The trigger isn't floppy and loose, the bolt doesn't come open if you touch it, or cant the gun over.

In fact the S400 has been shoved to the back of the cabinet for a few months now.