received my N66C timely and after initial lubrication, I used it to drive hundreds of ringed shank nails to install fence boards. Never had a problem and I like the product. I have hundreds of boards to go. Wish I have ordered the N75 model, I think is the one, that can take larger diameter nails that was only a few bucks more. This is the first time I have used a nail gun for fence and regret not using it before. Easy to use and only had a few double fires as I did let it bounce. I am aware of that and have not had that happen again. Just ordered another Bostitch product as I am very pleased with their tools and price.