If I had to guess, maybe something like -Also does anyone know what RLG, PT and PS mean on the Ruger box?
Wayno, Hittmann: Do either of you know how the ones Wayno posted compare in size to the target checkered I'm seeking?"Feel" is everything and very subjective. The grips that don't work for WAYNO are great for me. The grips you're seeking, I didn't care for at all. Too big, too slick, felt cheap; like S&W targets.
That being said, I only use them on a 6 inch Six Series.
Shop Ruger had these on sale a few years ago for under $10, should of bought more.