Let the Buyer Beware:  It is not obvious until you receive your Paslode nailer that it is not to be used above 4500 ft (according to technical support) and the box says 5000 ft.  We live in Colorado at 7500 feet and of course the gun is Dead ON Arrival - no fault to the gun.  And then you can't return it for a refund because it runs on gas ... so let's just say that this was a VERY disappointing purchase from Amazon, who should be able to state very clearly the limitations of every product sold.