Relying on the same cylinder valve drive system as the original NR83AA, the NR83AA5M offers both a rapid response and some serious driving power, to quickly and consistently sink up to 3 1/4-in x0.131-in into the toughest materials. With the selective actuation now on the trigger, we not only reduced the total number of parts in the trigger but also eliminated all composite parts. Choose contact or single sequential actuation mode via switch on the trigger. 30° paper strip clipped head or offset round head nails from 2 to 3 1/4-in length. Two-step rear loading magazine for quick replenishments.