Hello All, My first question. I am new to the forum, but have actually come here many times to read and learned from you guys. I saw the iPhone app and decided to join. Anyway, here is the question. Can you use the recoil spring assembly for a Glock Gen 4 on a Gen 3 Glock? I have a few Glocks but I haven't seen the Gen 4 yet, and I am wondering if the recoil system can be used from one to the other. Thanks! I am looking forward to a wonderful time here.