We have Gen. 4 guide rods for G17 and G19 size frames, in both Steel and Polymer. These are designed specifically for the Gen. 4, and not simply an adapter washer on a Gen. 3 rod. (The Gen. 3 rods are too small for the channel in the frame) If you'd like to order the Generation 4 G17 Hardened Steel guide rod and spring, they're on our site now. These will fit all Gen. 4 G17, G22, G34, G35 size frames. If you'd like to order the Generation 4 G17 Polymer guide rod and spring, simply order the steel one and send an e-mail to me requesting the substitution for Polymer - this is what we're doing while we are waiting for the webmaster to update us. The same goes for ordering the Gen. 4 G19 / G23 in either Polymer or Hardened Steel, and these ship with the 15# spring. Simply order the Gen. 4 G17 Steel, and send a follow-up e-mail requesting the substitution. Sorry for the inconvenience until the website is updated. Thanks all, our guide rods seem to be helping with the few who are suffering malfunctions, and all who simply want to have the ability to change the spring - just like a Gen. 3. Please feel free to e-mail with any questions, and of course thanks all for your past support! I'll give away Gen. 4 G17 / G22 guide rods with 15# springs to the first 2 people to respond, time for another gveaway........ Thanks, jager Wanna kill these ads? We can help!