I got a P3AT very soon after they became available 5 years ago. At first, I worried because almost every brand of ammo "resisted" feeding into the chamber if the slide was cycled manually.
However, it seems to shoot fairly reliabily if the slide was cycled by FIRNG the pistol rather than cycling the slide by hand.
After about 150 rounds, all "stove-piping" and jamming disappeared and while the slide has to be pushed forward with my thumb when it was cycled manually, it fired most any rounds ok.
Finally, I decided to send it back to Kel-Tec to see if a little "TLC" would eliminate the little pistol's resistence to cycling properly when the slide was functioned by hand. Got the pistol back in a couple of weeks minus the magazine which I sent in with the pistol.
Called Kel-Tec and the lady who answer said she was the one who repacks and returns the Kel-Tecs to customers and she was SURE she sent the magazine with my pistol if I sent one in with the pistol. I assured her that she DID NOT send the magazine... and, finally, after a little disagreement, she sent another replacement magazine.
Once I got the new magazine, I filled it with Federal 90 grain "Hi-Shoks"... the round-of-choice at the moment and tried cycling the pistol by hand. Again... I had to push the slide closed just as I to do before I sent it back for a "polishing" of the ramp and a check out.
I have tried Mag-Tech "Gold" 85 gr. +P's, 90 grain Cor-Bons, Speer 90 grain Gold-Dots and Federal 90 grain Hi-Shoks (NOT "Hydra-Shocks"). All these various rounds have been hollow-points... and all of them originally required a "push" on the initial rouind when the slided was cycled by hand in order to fully seat the round in the chamber.
HOWEVER... at various times (but NOT "consistently") during the past several months, the Federal Hi-SHOKS have begun to cycle normally (after 5+ years and a return trip to the factory) when the slide is functioned by hand.
Regardless... when FIRED rather than functioned by hand, I've never had the rounds FAIL to function and load except during the first 125 rounds I fired through the little pistol... and so I "trust" the little pistol completely... and carry it concealed 24/7/365 !!!
I handled the new .380 Ruger COPY of the P3AT at the NRA National Convention held in Louisville, Ky. several months ago and found it was almost an EXACT copy of the Kel-Tec with basically only the barrel extension had been changed to possibly improve (in Ruger engineer's minds) the reliability of the little pistol.
However, I DID notice that, for some unknown reason, the Ruger folks, whom I admire and completely trust... and have proven it by buying 8 of their products over the years including both rifles and handguns... made the already short handle on their copy of the P3AT even SHORTER !!! I do NOT have large hands, but I found it difficult to put and KEEP much more than my middle finger on the little Ruger's handle while my forefinger is on the trigger.
The Ruger factory representative with whom I was speaking told me that Ruger intends to bring out a "finger-hold" on the bottom of their magazine to facilitate holding onto the littlest Ruger pistol. While that would solved the short-handle-problem, it would also interfere with the ease of getting the little pistol in/out of one's pocket and it IS a "pocket/mouse gun"!!!
Other than that... I like the littliest Ruger just as I've liked and trusted Ruger products in general in the past... and I've never been disappointed.
As to which "mouse-gun" I'd buy...? My Kel-Tec is 2 ounces lighter and, discounting the small extra manual "push" the slide needs to sometimes "close" when functioned MANUALLY on the first round (which the littiest Ruger may ALSO require), I believe I'd choose the Kel-Tec due to it's lighter weight and very slightly longer handle which makes holding onto it considerably easier... and since the new littliest Ruger is just now becoming available, the "jury" is still out on whether or not it will function and work properly.
There's also a $30 "difference" (about 10%) in the cost with the Kel-Tec being the lesser expensive. Don't be afraid to buy and trust the Kel-Tec, but if you want a name brand gun, you can't beat a Ruger for good value and ruggedness... something on which their excellent reputation is based.
Strength & Honor...
Ron T.