This is a genuine manufacturer-sourced component which is specially designed for use with Bostitch staplers. The magazine is utilized to hold the staples that are fired by the tool. It is an identical replacement for a missing or a faulty magazine body assembly that was installed on a new unit. Please make sure to refer to the owners manual and the appropriate diagrams of your model for the correct location and application of this part. Keep in mind this high-quality magazine assembly is made of durable metal and is sold individually.