This stapler gets caught at the end of almost EVERY row of staples. I use 3/8" Freeman staples because they're the only ones I can find. If the stapler works then everything is fine, but sometimes the jam at the end of each row of staples is so severe that other tools are required to clear it. If it doesn't close completely when you add more staples, there is a loose staple somewhere that needs to be removed. Wear safety goggles as they can throw off a piece of the cut braces. I ran it to the PSI spec, so that wasn't a problem.