I remember when the P3AT first came out. I thought to myself, I sure wish someone would come out with a well made, reliable, pocket .380. I didn't have to wait long before Ruger did just that.You may be referring to the LCP II. I haven't kept up with that. When Ruger first released the LCP, it was a part-for-part direct copy of the P3AT to the limits of manufacturing tolerance, with a prettier injection molded frame and an added slide stop. There are images of the exploded view bill of materials of both pistols. Ruger changed some part names but the parts were identical. The LCP was not just the same design as the P3AT. Most of the parts were interchangeable.
First let me start with... I have owned and still own quite a number of Kel-Tecs and Rugers firearms of all varieties. I believe both to be great manufacturers that make good weapons and have quality customer service. Acknowledging that this is a Kel-Tec Forum and there will be some biased...www.thektog.org
The biggest difference was Ruger wasn't quite exact in their copy and managed to introduce a drop safety issue in the LCP, necessitating a recall.