Your talking about the ones that have the large disk type thing on the bottom right? I never had a G&P, but I had a ****** knockoff on my old m16. I found it to be great if I was prone with the rifle on a bipod, but it was very un comfortable when ever I was in any vertical position(ie. kneeling, standing, sitting). If you are going to be using your rifle like a DMR and be lying down a lot, then you will probably like it, but if you plan on using it like a normal battle rifle, I would recommend a normal style grip.