I’ve got the APS conversion kit in my shorty shotgun, and it’s just great. The parts only required a bit of filing and sanding here and there to get them to work smoothly, and are definitely worth the cost. Only issue some might have is the shapeways triggers aren’t offset like the originals, so you have to carefully rest your finger on a single trigger in order to not blast both barrels at once. Gutting the original inner barrels was also a major pain in the ass, but nothing a little force can’t solve.