Clean and Maintain the Tool
Simple maintenance will help you avoid problems like a sticky barrel slide and spent power load casings that won't eject (which is also caused by using drive pins longer than 2-1/2 in.).
Each day, after regular use, inspect the unloaded tool for damage and then take a rag and clean out the chamber and around the barrel. Buy barrel brushes from your PAT tool distributor and clean the gunpowder residue out of the inner working parts. Spray a little WD-40 lubricant on the inside and all over the outside of the tool and then wipe those areas clean and dry.