Just bought and shot a P99 this past weekend. I got the 9mm flavor. The accuracy was great, the single action trigger has a lot of take up in it, the double action is pretty long, the decocker is a good solution, the mag release works great with your trigger finger, and the fit and feel are superb.
I put the smaller backstrap on the grip and loved what it did for the gun. The finger grooving on the front strap is comfortable. My fingertips land in the hollowed out area on the left side of the grip and it just 'feels' right to me.
My groups varied with the ammo; I got my best results with 115gr FMJs. At it's best, the 99 was putting five shots in two inches at 30 feet. At it's worst, it was putting five shots in 3.5 inches. I did notice that regardless of ammo fired, the last shot of each clip seemed to be kicked out about an inch from the rest of the group. I'm not sure if that was a function of the gun or me just getting distracted.
Only two negatives appeared. The first was that after firing 5 or 6 rounds of a clip, I started to feel like my trigger finger was getting pinched sliding back over the raised hump in the middle of the trigger guard.
The second was that two or three times in a couple hundred rounds, I had to nudge the slide back to it's resting spot (with S&B ammo) before I could fire another shot. The Winchester 115 FMJ's cycled fine.
Recoil was exceptionally light and manageable--it put me in mind of the Beretta Cougars that I have shot.
The more I shot the gun, the more I liked the trigger 'stages'. With a striker fired weapon, I love the idea of a decocker that will allow me to put the gun back in my holster after firing without having to worry about whether or not I'm in single or double action mode.
The unique 'cocking' action that lets you cock the gun by only advancing the slide about a quarter inch is great--especially when you're doing dryfire routines. It also proved to be very handy when I would shoot five rounds, decock the gun, set it down on the bench, retract the target to mark my group, send the target back out, and then re-cock the gun to single action trigger by simply advancing the slide a quarter inch. It's a cool feature.
I fired two and three shot 'double taps' with pretty fair accuracy and have to tell you that you can cycle that second shot so fast that it'll surprise you the first couple of times you do it. That's not a bad thing, it's an improvement over just about any gun I've ever shot, but it does happen so fast it surprises you.
Now if I could just figure out what to do about the 'pinching' sensation after a half dozen rounds.
Did I mention that everybody at the range wanted to borrow 'the Bond gun'. It shoots as great as it looks.
Just my opinion... but then again, according to some people around here, I'm just a hopelessly biased Walther fan unwilling to buckle under to the undeniable brilliance of Sig weaponry.
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Take the long way home...