A grip extension isn't going to cause double feeds. The worst it can do is slightly decrease your magazine spring tension and if that causes a malfunction it will not be a double feed. I have been using Pearce extensions on a variety of Glocks since 1990 or so - never had a problem.Has anyone here experienced double feed after installing the Pearce grip extensions?
Why? I've used nothing but Pearce for 30 years, on duty, competition and CCW guns - 100% reliable.I just stay away from Pearce!