I did receive the 20 round mag, I keep it in my range box, it shoots in the 92 and 917. The recoil spring is about an inch or so shorter in the 917, because the slide is shorter than the 92 by that much. I was thinking about what porting the barrel in this config would do. Would it reduce muzzle climb for better follow up shots? Might be good for competetion for that reason alone.