I ordered what I thought was the heavier inner spring. I ordered it last Friday and it was delivered today. I can't really tell any difference. It has the same number of coils and appears to be the same gauge of wire. It feels the same, too. I am going to call them tomorrow to see if they shipped the new version or the old version. The website doesn't really give any info as to "new version".jocko said:Kahr has recently went to a heavier INNER recoil spring for the P380, so if u are having any FTRB issues . Etc, just order the entiere new set as they come as a pair,but the only change is the inner recoil spring..