Doesn't go all the way through 1 inch red oak over pine joists like my regular 18 gauge nailer; it is weak. I asked for a replacement thinking it was the problem but the second one was even worse. I tried to contact tech support twice, the first time I got a call back after 7 hours and the tech hung up; The time of the stairs was 4 hours later and the technician had no idea. Really bad!