Dirk,Got the extended release button from Shotgun Sports Magazine today. Heard it was a bear to install. Understatement. Reminded me of kids Christmas presents with the dreaded words. "Some assembly required". The instructions may have been written by someone who never installed one before. Finally got it done and works well.
If you're talking about the one pictured with the long ramp, that's the Dave's Metal Works one that hangs down below the receiver. Beware! I just read a long article on installing one that says it involves a lot of filing, cutting, and more filing, and it has to be adjusted perfectly to work. It has to be pressed almost all the way in to release the bolt. OK for feeding a shell for doubles but impractical for singles and handicap.Just get the compition one from Midway USA they work the best.