That's interesting about the P40. I have one (along with a P11 and two P32s). Mine has had numerous jamming problems. I had read about "limp wristing" being a problem, and that's what Kel-tec told me when I called. While a vise-like grip may help, I think it's a little silly to say that the P40 problems are user error. I'm 6'2" and 235 lbs. I've been shooting all types of handguns since the mid 1970s. I made a concious effort to hold my P40 very firmly (always two-hand hold). I've never had this type of problem with any other handgun. If I can't hold it firmly enough when shooting calmly at the range and focusing on this, I don't think I'd want to count on this gun in a self defense situation.
I'm still hopeful that I can get my P40 working reliably. I've done the following to the handgun:
1) As Kel-tec suggested, I bent the top of the magazine spring down somewhat so that it is parallel with the other coils (the top coil was originally bent up at a sharper angle).
2) I bought some .40 ammo with lighter bullets (I'd tried 4 or 5 brands of 180 gr ammo, mostly FMJ, and experienced numerous failure to feed problems with all).
3) I polished the feed ramp with fine sandpaper. This gives me the most hope. It was originally pretty rough, and bullets would catch and not feed into the chamber. Since I polished it, it seems to feed much more smoothly when manually cycling the action.
4) I slightly polished and lubricated the slide rails, etc.
I haven't had a chance to try it since making these changes. I'm hoping the thing will work reliably. If not, I think Kel-tec may have made the right decision in pulling it from the market.
Doug