Most air nailers are made of shore like China ,Taiwan Malaysia etc. and there are good and bad .
When choosing a nailer look for certain details like how the drive pin is attached to the piston and how the front cover of the nose is held in place .
If you send me the model numbers I will give you my opinion .
I have sold and repaired many nailers over the years and seen a lot of problems with certain models even incompatibility with fasteners .