I picked up a locked 342pd about six or so months ago. I love it. Mine comes in at 10.8 ounces. It has the original grips on it. Like you, the last thing I wanted to do was put a large, heavy set of grips on it and make it the same weight as the LCR I had.

I pocket carry 95% of the time, and this gun is a pleasure to carry. Some guys will say a few ounces doesn't make a difference, well, good for them. But its a noticeable difference to me when pocket carrying. There is a guy on this board who owns a 342 and knows the exact weight of several grip options for the 342. Maybe he will chime in. Here is a thread where he posted several grip weights. I'd like to try the Eagle Secret Serice grips or the Ahrends. SEEKING OPINIONS ON "VZ GRIPS"

You will need to experiment and find what ammo works for you.