I bought this roofing tool to re-roof my 1500 sq ft home...it did not work properly from the beginning...was prone to misfiring - such as firing when first attached to the compressor - it finally blew apart after a couple of weeks with the top hitting me in the face...this tool is DANGEROUS!!! Spend the extra bucks and get a name brand tool that will do the job without a risk of maiming it's user. This thing should be taken off the market!