I bought one for my G26 Gen 4 from Glockmeister. About $50 w/shipping. I haven't had a chance to try it out at the range yet. There's other brands out there. BT guiderods, Rock Your Glock, Glockstore and probably some others I don't know about. Hope this helped!I am considering purchasing an aftermarket recoil spring for my G26 Gen 3. Any advice or recommendations?