Do not get the 105s. I made that mistake. I quickly sold them. It made the 340PD hard to control and hurt badly when shooting. The OEM rubber grips are way nicer and even then don't cover the backstrap, I found them much more comfortable to shoot.
The LG405s are nice. Very comfortable. I have decided not to use a laser on my 340PD. I sold mine. I bought a revolver because they are simple and reliable. The laser just complicated things for me.
I tested how good I could aim without using any sights at all. I would hold my gun in the dark without looking at the sights, point towards a dimly light object. I would then turn on the laser. The laser was almost always where I wanted to shoot. This was at normal self defense ranges (20 feet or less).