The BL7500 is a professional quality bulk load gun recommended for heavy-duty usage. It has a higher ratio for reduced hand fatigue, This gun is suitable for higher viscosity products. Not only that, but it's environmentally friendly. The bulk load system eliminates the 10 oz cartridges that clutter the typical job site and end up in the local landfill. Less plastic waste, less cost per unit of product gunned, lower quotes...what more could a contractor ask for?