Quite a bit of difference in everything. There are, at my last count, 8 different adapters for the big 3 of Remington, Winchester and Mossberg shotguns. Most are of very high quality, mine included. Some are plastic and start at less than $40, others are machined for about the same price. They can run as high as $240 just for the adapter as I found on a Florida dealers website. The product manufacturer was unknown. As a tool and die maker I know the in's and outs of manufacturing a product. I designed it and a company I deal with will investment cast it in Aluminum right here in America. Michigan to be exact. You can also get it in Magnesium and Stainless Steel. We went with the one piece design to reduce costs add a little style and make it more like the factory would make it Kind of like the FN TPS. Now, if you want a comparison.... As I say in my FAQ on the website, our costs are the same as anyone else when it comes to manufacture. We priced it at a fair market value and I feel a fully dressed adapter for less than $110 (with the stock and psitol grip) is something most people can afford. As for quality, I designed it, I built it, I guarantee it. Thanks for the Promo.