Used this for my ar10 build - ATI Outdoors AR-15/AR-10 Classic Pistol Grip

Grip fits great and feels comfortable in my hand it feels solid, nothing like a cheap feeling grip. My only complaint is that when screwed down tightly there are still some visible space where the top doesn't tightly/snugly fit against the entirety of the lower receiver. I gave it 4/5 because it is very close and maybe im just being overly particular because there is not any noticeable play in the attached grip and the seams only have very minute gaps around the top.