Some folks glue a bright flourescent or gold bead into the little notch where the front dot is. Seems to work fine.
On one of my P-32s I recently glued a short (1/4 in.) length of green fiber-optic Shotgun sight. Haven't been to the range with it yet... but it glows just like a bright night-sight in even fairly low light! Looks promising.
I'm thinking that there is enough metal on the P-3AT slide that you could drill horizontally into the front and rear sight -- and insert a tritium gas tube in each position. It would create a "dot over dot" type of sight picture.
I asked Jack if he could do it and he said no. I don't have a drill press or a source for the tritium gas tubes....or I'd try it myself.
If you don't want to read my ranting, please skip this reply and accept my apology....
What difference does it make about the sights? Do you really think in the heat of a contact distance gunfight you're going to actually look at the sights? The P-3AT is a "belly gun".
LW Seecamp was always criticized for not putting any sights on his LWS32. His defense was something to the effect "if you aren't close enough to stick it in his ear, you're too far away." I think the P-3AT is a similar case as the gun was made to fill the same niche.
We can go to the range and punch holes in paper all day long. Move the target farther away, align the sights and "ooh" and "ahh" about how good/bad the grouping was. When the SHTF, unless you have icewater running in your veins, you're going to be focused on the BG, where he's going, what he's doing. You're going to point the fist with the gun in it at the BG and pull the trigger. You had better have practiced the same way or who knows where those rounds are going.
I hunt rats almost nightly with a .22 revolver loaded with rat shot. It is rare that I ever look at the sights to line up a shot, the rats don't stay in one place long enough, neither will the guy you're pointing that P-3AT at. He's going to be ducking and moving and trying to make things difficult for you to find him.
Learn how the gun feels in your hand when the sights are lined up and always, always, always hold it the same way. Muscle memory is a great thing. You're going to need it, 'cause if it goes down some other way, you probably have better options to try before you pull that trigger.
Okay; I see 2 downsides to "good sights" on a "belly gun", be that P-3AT, Seecamp, Davis Derringer, Tomcat or whatever.
First is the additional expense everyone pays regardless of whether or not the sights are really effective for the niche this gun fills.
The second, and more important I believe, is the false sense of security/capability they may instill. Even with the best sight system, the .380acp launched from a 2.7" barrel would be marginal at distances where use of sights is necessary. Unless you have nerves of steel, you aren't going to get precision aiming from a gun with a 3.8" sight radius. Add to that the marginal terminal ballistics of the cartridge and I fear over-confidence in what to expect from the little gun. Is an occular shot possible at 15 yards? Sure. Is that a likely outcome in the heat of the firefight? I don't think so, but then maybe you're a much better shot than I am. How far out would you take a shot with the P-3AT? My max range is about 7 yards and the shot would be marginal at that. With my primary carry gun move that out to about 15 yards. Beyond that I have other options to exhaust before engaging the BG.
Hey, if great sights on a hideout gun floats your boat, go for it. If they boost your confidence in the hardware, go for it. But please consider the points I've tried to make and don't go trying to get more out of the little gun than it's capable of delivering. If you envision longer shots when your balloon goes up, then perhaps you should consider spending your money on figuring out how to hide a more substantial sidearm, be that Glock, Sig, 1911, HiPower, whatever.
Honestly the only "upside" I see to good sights on a "belly gun" is that they make punching holes in paper more fun; therefore I'll practice more. Thus developing that muscle memory I mentioned in an earlier post.
But, it IS fun to be able to bounce around tin cans at reasonable distances with your carry gun!
Seems to me the ability to do THIS, as well as group shots tightly on paper, does nothing but INCREASE your overall confidence in your pistol.