nail gun worked fine for me. It accepts 0.131 - 0.113 inch nails. I've had smaller nails on occasion, but I doubt it has anything to do with the nails I bought. It looks like sometimes the driver gets 2 nails at once. It has been found that this does not happen as often when only one staple is loaded with nails at a time. Maybe loading 2 clips will increase the pressure on the driver? Despite this, the jams came out easily and I had no sticking or other problems with large nails. This is exactly what I wanted and it didn't break the bank. A good product.