I just got back after two weeks the slide I sent Glockmeister. I requested a set of night time sights and they provided free installation. I expected longer, but their turnaround was lightning quick! But main point was the installation was done great and I highly recommend them. My dilemma in purchasing night sights was who was to perform installation after buying. If you buy at Glockmeister, you have no fear. My only other mod I would like to put on my Glock is an extended mag catch. Is sending back the frame as easy?